A new species of Cyphostemma (Vitaceae) from South Africa

A new species of Cyphostemma (Vitaceae) from South Africa

S. Afr. J. Bot. 1996.62(4): 183-187 183 A new species of Cyphostemma (Vitaceae) from South Africa E. Relief* and A.E . van Wyk -National Herbarium, ...

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S. Afr. J. Bot. 1996.62(4): 183-187

183

A new species of Cyphostemma (Vitaceae) from South Africa E. Relief* and A.E . van Wyk -National Herbarium, National Botanical Institute. Private Bag X101 , Pretoria, 0001 Republic of South Africa H.G.W.J. Schweickerdt Herbarium, Department of Botany, University of Pretoria, Pre toria, 0002 Republic of South Africa

Reaived 2 January 1996; revised 10 April /996 Cyphostemma rubroglandulosum Relief & Van Wyk, a new species from South Africa, is described, illustrated and compared with other members of the genus in southern Africa. It is a climbing, succulent herb with consp icuous, red, multicellular, glandular hairs on the stems, leaves and inriorescences. The combination of glandular hairs, 3-foliolate leaves, and fruits with scatte red , multicellular hairs distinguishes it from all other members of the genus in southern Africa. Pollen grains are 3-zonocolporate with a reticu late tectum ; the closely spaced pores differ in shape and size. Associated with forest, C. rubroglandulosum is endemic to the Pondoland Centre, an acknowledged centre of endemism associated with Natal Group Sandstone (Msikaba Formation) in southern KwaZulu-Natal and parts of the adjacent Eastern Cape Province. Keywords : Cyphostemma, new species, Pondoland Centre, taxonomy, Vitaceae. 'To whom correspondence should be add ressed.

Introduction In a revision of the fa mily Vitaceae, Planchon (1887) described three new sections, Cyphostemma, Eucissus and Cayralia, under the genus CiSSlfS L. Alston (193 1) raised the section Cyphostemma to generic level, but his view was not widely accepted. For example. Silssenguth (1953), in the second edition of Engler & Prant]'s Die Naturlichen PflanzenfamiLien. placed the genus Cyphoslemmn in sy nonymy with C;SSIlS. Descoings (1960) reinstated the genus C)phostemmn, a step that is now generally rollowed. The purpose of this article is to describe a new species of the Vitaceac, hitherto misidentified as C. allatomicwn (C.A.Sm.) Wild & RB.Drumm. The oldes t collection seen, dates from 1910 (Rlldatis 970 in STE). The new species is referred to the genus Cyphostemma on the basis of floral bud morphology. Cyphostemma is charac terized by its oblong-cylindric floral buds, constricted at or near the middl e and with the apex usually inflated and hooded. This character, together with the presence of a disc divided into four gland s, distinguishes Cyphostemma fro m the other sou thern African genera of the Vitaceac. Species treatment Description

Cyphostemma rubroglandulosum Relief & Van Wyk , sp. nov. , C. anatomico affinis sed caules, pet ioli ct pedunculi glandu· losa unicus pubescentia, venae inferiora paginae folia non dense pubescentia multicellis trich omatibus differt. TYPUS.- KwaZulu-Natal: lzo tsha River, 16 Nov. 1969, Strey 9277 (PRE, holotypus; NH, isotypus).

Perennial, climbing, succu lent herb. Stems with red, multicell ular. glandular hairs. ribbed: tendrils present, Jeaf·opposed. Leaves digitately 3-roliolate; leaflets sessile or with petiolules up to 3 mm long, with multicellular eglandular and glandular hairs es pe· cially when young, margin unevenly toothed, larger teeth prese nt at termination of principal lateral veins, apex acute; terminal leaf]et obovate to broadly obovate. 80-125 x 50-75 mm; lateral leaflets ovate, 65-100 x 40-65 mm, base asymmetric; petiole 50--90 mm long, glandular-hairy. Stipules falcate, 5-6 mm long. inflorescence a cyme in ax il of a leaf, tric hotomous; peduncle 40-60 mm long, c lothed with glandular hairs; pedicels 2-4 mm long, wi th glandular an d multicellular hairs; bracts c. 1-2 mm

long, subul ate, with multicellular hairs. Flowers 4· merous. FLower buds c. 3.5 mm long, oblong-cylindric , constricted at or near middle and inflated at apex. Calyx c. 1 mm long, cupshaped, c. 2 mm across at widest part, with multicellular hairs. Petals ye llow, inflated and hooded at apex, outside with multicellular hairs. Ovary with multicellular hairs; style c. I mm long, subul ate ; stig ma subcapitale. Disc of 4 co ni cal glands. Fruit a berry, purple when ripe, subglobose, c. 14 x 11 rnm , with scatlered, multicellular hai rs, I-seeded (Figures I & 2). Palynology Pollen grains shed as monads; isopoiar. rad ially sym metrical, 3-zonoco lporate; subprolate, P (15-)17-19(- 22) jlm, E (12-)1416(- 17) !-tm; shape in polar view triangular to circular with mesocolpia plane to convex; equatori al view elliptic. Col pi long. narrow, extending over about 4/5 the length of the polar axis. Tec· tum reticulate; pores densely spaced, of different shapes and sizes (Figure 3). The Vitaceae is ste nopalynou s w ith only minor vari ati on in general pollen morphQlogy. Pollen of C. rubroglandulosum is vcry similar to pollcn types described by Schirarend & Kohler (1993) in their account of the pollen of the Rhamnaceae, a family closely related to the Vitaceae. Reproductive phenology Inflorescences are many-flowered. with the flowers appearing from October to December, when fruits set. Etymology The specific epithet ' rubroglandulosum' refers to the red glandu· lar hairs. an outstanding feature of various parts of the plant. The young stems. petioles, peduncles and pedicels are also tinged red. DiagnostiC characters and relationsh ips Cyphoscemma rubrogfandulosum clearly belongs to the genus Cyphostemma because the flower buds are oblong-cylindric and constricted more or less in the middle, with the petal s inflated and hooded at the apex (Figures 4 & 5). In Rhoicissus Planch., Ampelocissus Planch. and Cayratia Ju ss. of the Vitaceae the flo wer buds are globos~ in outline, whereas those of Cissus are conical to ovoid.

S. Afr. 1. Bot. 1996.62(4)

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Holotype of Cyphostemma rubroglandulosum, Strey 9277 (PRE).

Figure 2 Cyphostemma rubroglandulosum. Inflorescences, Abbolt 1434 (PRU). Scale bar: 5 mm.

Leaves in Cyplwstemma are usually 3- or 5·foliolate, but simple; 3-foli olate leaves with leaflets divided into three again, also occur. C. rubroglandulosum resembles C. anatomicwll (C.A. Sm.) Wild & R.B.Drumm. in having 3-foliolate leaves, but its indumentum possesses red. mu ltice llular, glandular hairs (Figures Cr8), sometimes intenningled with a few muhicellular hairs, compared with mainly multicellular hairs with a few red hairs scattered along the stems in C. anatornicum. In addi tion, C. rubroglandulosum is geographically separated [rom C. allatomicum. C rubroglandulosum occurs in KwaZulu-Natal and the Eastern Cape, whereas C. anatomicum is found in the Northern Province and Mpumalanga. Retief (1993) provisionally recognized 12 taxa of Cyphoslemma in KwaZulu-Natal. A summary of the differences between C. rubroglandulosum and other members of the genus in KwaZulu-Natal is supplied in Table I. Distributi on, habitat and conservation status

C. rubroglandulosum is endemic to the Pondoland Centre (Figure 9). This region is a centre of plant diversity, associated wi th the

S. Afr. 1. Bot. \996,62(4)

outt:rops of Natal Group Sandstone (Msikaba Formation) between Oribi Gorge in southern KwaZulu-Natal and Port St lohns in the Eastern Capc Province (van Wyk 1990, 1994). The specics occurs

185 in forest and along forest margins. It is the only member of the Vitaceac endemic to the Pondoland Centre. C. rubroglandulosum is rairly common and under no immediate threat

Figures 3-8 Cyphoslemma rubroglandulosum. 3. Pollen grain. 4. Flower bud. 5. Hooded apex of flower bud. 6. Young stem with glandular hairs. 7. Head of glandular hair. 8. Multicellular stalk of glandu lar hair. All from Van laarsveld & Campher 130 (PRE). Scale bars: 3 = 2 ~m; 4-6 ~ 200 ~m : 7 & 8 ~ 20 ~m.

186

Table 1

S. Afr. 1. Bot. 1996.62(4)

Comparison of diagnostic characters of members of Cyphostemma in KwaZulu -Natal Geographi cal region

Diagnostic characters

in KwaZulu·Nata l

Habitat

Hahi t

Stem indumcntum [

Leaf morphology2

Fruit indumentum

C. rubnlglofldu/osul/I Relief & van Wyk

Soulh

Forest. forest margins

Climber

Multicellular. stalked. red. glandular hairs

3-foliolatc. with long

Multicellular hairs

C. flav(/lortlln (Sprague) Desc.

South

C. ,wbdli{/(um (Baker)

North

Taxa

Dune sc rub; beach Climber or sand creeper Open scru b

Climber

Desc.

Multicellular hairs

petioles 3-fotioJalc. with short Mu lticellular hairs pet ioles

Multicellu lar hairs 3-foliolatc. sess ile or Mult ice llular hairs intermingled with long, with very shon petioles

thin glandu lar hairs C. I1QlaliriulII (Szyszyl.) J.J.M . van der Merwe

Widespread

Rocky grassland: forest edges: d istu rbed arCDS

C. hypolel/(: um (Ha.rv.) Desc. ex Wild & R.B. Drumm.

South

Forest. forest ffi Drg ins; scrub

C. cirrhwum (Thunb.) Desc . ex Wild & R.B.Drumm. subsp.

North

Climber or Scattered. shortly straggler stalked, glandul ar hairs

3-foliolate w ith lea.flets divided into three again

G labrous

Climber

Multi cellular hairs, occasionally with a few red. stalked. g landular hairs

5-folio late. with lon g petioles

Multicellular hairs

Fores t margin: scrub

Climber

Fine mult icell ular hairs

5-fo liolate . shortly petiolate

Multice llu lar hairs

Mainly along the coast

Coastal dune bush; understratum of forest

Climber

Scnuered mul ticel lular hairs

5-foli olate, with long petioles

Multi cellular hairs

North

Rocky grassland

Climber

Multicell ular hairs

5-foliolate. with long petioles

Multicellular hairs

C. Jimulal1J (C.A. Sm.) Wild & R.B.Drumm.

Central

Fores t margins: thorn -veld

Climber

Multi ce llular and 5-folio late. with shari scattered. stalked. petioles glandular hairs; glands usually opaque with red heads

Multice llular hairs and scattered. stalked glands

C. spil/().HJpilo.ml1l (Gilg & Brandt) Desc.

North

Grassland

Erect herb

5-foliolate. with shon Stalked. glandular Glabrous or with petioles stalked. g landular hairs hairs

North and central

Bushveld. rocky slopes

Erect herb

Conspicuous long. stalked. glandul ar hairs intermingled with shorter glandu lar hairs and multicellular hairs

5-foliolate. sessile or very shortly petiolate

Mulricellular and stalked. glandul ar hairs

C. w()odii (G il g & Brand t) Desc.

North

Bushveld

Erecl herb

Sessile glands

5-foliola te. with long petioles

Sessile gl ands

C. humile (N. E.S r.) Desc. ex Wi ld & R.8. Drumm. subsp. hWllile

North

Grass land

Prostrate herb

Multicellular hairs and scattered , stalked g lDndular hairs

Simple. with short petioles; margin with large teeth

Multicellular hairs

C. humile (N.E.Br.) Desc. ex Wil d & R.8. Drumm. subsp. doJich ()pu.~ (C.A .S m.) Wild & R.B.D rumm .

North

Grassland

Prostrate herb

Multicellular hairs and thin, stalked. g landular hairs

Simple. with short Multicellul ar pet io les; margin with hairs . intermingled large and smaller w ith stalked, teeth glandular hairs

j.'irrhflJ/II1I

C. cirrhom", (Thun b.) Desc. ex Wild & R.B.Drumm. subsp. tral1.n'aalens;.~

(Szyszyl.) C.A.Sm

C. .wnder.w mii (Harv.)

Desc .

C. barbosae Wild & R.B.Drumm.

IStalked. glandu lar h airs always opaque. unless stated o lherwi se 2Pet iole length: short

=usuall y < 30 mm; long =usua lly> 40 mm.

Specimens examined -3030 (Port Sh epslone): Oribi Gorge Pass (- CA), Rerie! 1626 (PRE); lWl,ha. upper region (-CB ), Strey 7174 (N H, PRE): Urn tarn-

vuna Nature Reserve [UNRj, Gogosa K1 00f (-Ce), Abbott 15578 (PRU); Paddock. Holgate Farm (-CC). Abbott 1434 (PRU); Padd.DCk. river valley, tributary o f the Nc hlanga River (~CC). Williams

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ruhmR/tIIldulosum.

940 (NH): lzolsha River (-CD). Srrel' 9277 (N H. iso.: PRE. hol o.). -3129 (porI SI Johns): Manteku. Dakanc Location (- DA), Strey 10189 (NH. PRE).

-3130 (Port Ed ward): UN R. below Rose Cli ff (-A A). Abbott 13318 (PRU): UN R. High Fares< (-AA). Abbott 1506 (PRU): UN R. Clc
Acknowledgements The aU[hors wish to thank Tony Abbott and Ernst van Jaarsveld for plant material and information on the new species. Emsic du Plessis critically read and improved the manuscript. References ALSTON, A.H.G. 1931 . Vitaceae . In : A hand-book to the fl ora of Ceylon, ed. H. Trimen. Vol. 6, Suppl. 53. Dulau & Co., Lon don . DESCO INGS . 8. 1960. Un genre meconnu de Vitacecs: compn!hCnSlOn CI distinction des gen res 'Ci ssus' L. CI 'Cyphoslcmma ' ( Planch.) A lslOn . Notul ..f)'Sf. 16: 113- 125. PLANCHON . J.E. 1887. CiSSIIJ Sect. Cyphostemma (as 'Cyphostomma'), In : Monographiae Phanerogamarum. cds. A. & C. Dc Cando lle. Vol. 5.2. p. 472. Masson, Paris. RETIEF, E. 1993 . Vitaceae. In: Plants of southern Africa: names and distribution, eds. T.H. Arnold & B.C. de Wet. Mem. But. Sur\,. S. Afr. 62:

492-493. SC HIR AREN D. C. & KOHLER. E. 1993. Rhamnaceae. In: World pollen and spore flora. ed. S. Nilsson. Vol. 17/18. pp. !- 53. Scandanavian University Press, Oslo. SOSS ENGUTH. K. 1953 . Vilaccae. In: Die natii rlichen Pflanzcnfami lien. eds. A. Engler & K. Prant!, Band 20 d, pp. 174--333. Dunckcr & Humblo!. Berlin. VAN WYK. A.E. 1990. The sandstone regions of Nala l and Pomloland: remarkable centres of endemi sm. In: Paleoecology of Africa. ed. K. Heine, Vol. 2 1. pp. 243-25 7. A.A. Buikema. Rotterdam. VAN WYK. A.E. 1994. Maputaland- Pondoland regio n. In: Centres of plant diversity, a gu ide and stalegy for their conservation, eds. S. D. Davis. V. H. Heywood & A.C. Hamilton. Vol. 1. pp. 227- 235 . Informalion Press. Oxford.