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Asclepiadaceae Borkh. Search in IPNISearch in NYBG Virtual Herbarium Decrease font Increase font Restore font
 

Published In: Botanisches Wörterbuch 1: 31. 1797. (Bot. Wörterb.) Name publication detail
 

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
Contributor Text: S.I. ALI
Contributor Institution: Department of Botany, University of Karachi, Karachi.
General/Distribution: A family with 175-180 genera and 2200 species (Willis, Dict. Fl. Pl. Ferns, 98.874. 1973) distributed mainly in the tropical and subtropical regions of the world; represented in Pakistan by 23 genera and 41 species. Opinion seems to be divided about segregating Periplocaceae from Asclepiadaceae. For instance Bullock (in Hutchinson & Dalziell, Fl. Trop. Afr. ed. 2. 2:81. 1963) and Huber (in Abeywickrama, Fl. Ceylon 1:28. 1973) have treated the two as independent families, whereas, more recently, Markgraf (in Tutin et al., Fl. Europ. 3:70. 1972) Rechinger f. (Fl. Iran. 73: 1. 1973), Spellman (in Ann. Miss. Bot. Gard. 62:103, 108. 1975) and Stevens (in Saldanha & Nicolson, Fl. Hassan Distr. 437. 1976) have taken a broader view and have accepted the family Asclepiadaceae including the subfamily Periplocoideae. We have also accepted the family in a broader sense.
Comment/Acknowledgements: i) Subfamily Asclepiadoideae

a. Tribe Asclepiadeae : Asclepias, Calotropis, Cynanchum, Glossonema, Holostemma, Oxystelma, Pentatropis, Pergularia, Sarcostemma, Vincetoxicum.

b. Tribe Marsdenieae : Hoya, Marsdenia, Telosma, Tylophora, Wattakaka.

c. Tribe Ceropegieae : Caralluma, Ceropegia, Leptadenia, Orthanthera.

ii. Subfamily Periplocoideae

Tribe Periploceae : Cryptolepis, Cryptostegia, Hemidesmus, Periploca.

Acknowledgements: I am grateful to the authorities of the following herbaria for herbarium and library facilities: Royal Botanic Gardens, Kew; British Museum (Natural History), London and National Herbarium, Islamabad. I am indebted to Mr. B.L. Burtt, Mr. I.C. Hedge (Edinburgh) and Mr. David Field (Kew) for going through the manuscript and offering suggestions for its improvement. I am thankful to Miss Surayya Khatoon who has kindly executed some of the illustrations. The financial assistance received from the United States Department of Agriculture under P.L. 480 with the coordination of the Pakistan Agricultural Research Council, Islamabad, is thankfully acknowledged.


 

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Erect, creeping, scrambling or twining herbs and shrubs, sometimes succulent, usually with milky latex. Leaves opposite, simple, sometimes reduced or absent, exstipulate, entire. Flowers actinomorphic, bisexual, 5-meous, in terminal or lateral umbelloid, corymbose or paniculate cymes. Sepals united, shortly connate or almost free, imbricate. Corolla gamopetalous, rotate, campanulate, tubular, lobes valvate or twisted in bud, rarely imbricate. Stamens 5, epipetalous, alternating with corolla lobes, either connivent by the anthers (Periplocoideae) or completely connate and adnate to the style apex forming a gynostegium (Asclepiadoideae). Corona of one or two series, attached to the corolla or to the staminal column or the outer series to the corolla and the inner to the staminal column. Anthers longitudinally dehiscent or opening by terminal slits. In Periplocoideae the pollen grains are in tetrads and fall into spatulate pollen carriers with adhesive disc formed on the surface of the style apex between the anthers. In Asclepiadoideae 1 or 2 pollinia (waxy masses) per anther locule are present; the pollinia of adjacent locules of adjacent anthers are connected by the translator apparatus, which consists of a corpusculum and two arms or retinaculae, each of which bears a pollinium. Carpels 2, superior, united only by the enlarged style apex, multiovulate, placentation parietal. Fruit of 2 distinct or single (by abortion) follicles. Seeds flattened, without an aril, comose.
 

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1.Plant cactus-like, stem thick fleshy
Caralluma
1.Plant not cactus-like
2.Plants erect
3.Filaments usually free; anthers acuminate or with a terminal appendage; pollen masses granular, in pairs in each cell
Periploca
3.Filaments connate, pollen masses waxy
4.Anthers an expanded membranous tip; pollen masses waxy (pollinia), solitary in each cell (10 in all) sessile or pedicelled in pairs on corpuscule, pendulous (Tribe Cynancheae)
5.Corona double or with appendages on the inner face
Cynanchum
5.Corona single, without appendages on the inner face
6.Follicles echinate
Glossonema
6.Follicles smooth
7.Generally a leafless shrub or leaf (when present) 6-7 mm long
Periploca
7.Plants with normal leaves
8.Corolla lobes twisted
Vincetoxicum
8.Corolla lobes valvate
9.Coronal processes laterally compressed; shrub or small tree, leaf base cordate
Calotropis
9.Coronal processes spathulate; herb, leaf base tapering
Asclepias
4.Anthers incumbent on the stigma, without a membranous tip; pollen masses one in each cell (10 in all) sessile in pairs on the corpuscule
10.Calyx turbinate, 5-lobed, corolla rotate
Leptadenia
10.Calyx 5-partite, corolla salver-shaped
Orthanthera
2.Plants climbing or scrambling
11.Filaments usually free; anthers acuminate or with a terminal appendage; pollen masses granular, in pairs in each cell
12.Coronal scales connate into a lobed ring
Periploca
12.Coronal scales corolline, free, short, thick
13.Corolla lobes valvate (corolla rotate)
Hemidesmus
13.Corolla lobes twisted or imbricate
14.Corolla 10-14 mm long, rotate
Cryptolepis
14.Corolla 5-6 cm long, funnel-shaped
Cryptostegia
11.Filaments connate into a tube; pollen masses waxy
15.Anthers incumbent on the style-apex without a membranous appendage
Ceropegia
15.Anthers with a membranous appendage
16.Pollen masses pendulous (1 in each cell, 10 in all)
17.Corona double
18.Follicles echinate
Pergularia
18.Follicles smooth
19.Trailing leafless shrub
Sarcostemma
19.Twinning leafy shrub or herb
20.Corona tips curved over stigma; corolla divided half way down
Oxystelma
20.Corona tips not as above; corolla divided more than half its length
Cynanchum
17.Corona single
21.Corona 5-lobed
22.Corona segment produced at the base into a spur and the apex into a slender tip
Pentatropis
22.Corona segment without a spur, the apex not as above
Vincetoxicum
21.Corona 10-lobed
23.Corolla> 10 mm long (in our species)
Holostemma
23.Corolla 5 mm or less long
Cynanchum
16.Pollen masses erect, rarely horizontal (never pendulous)
24.Corolla lobes valvate
Hoya
24.Corolla lobes twisted
25.Corona lobes tubercle-like and entirely adnate to the staminal column or radiating from its base
Tylophora
25.Corona lobes with their basal part adnate to the staminal column, shortly free above
26.Corona lobes without a process on the inner face of their free apical part
Marsdenia
26.Corona lobes with an apical tooth or an appendage arising from the inner face
27.Corona lobes with the free part expanded and with a linear appendage arising from the inner face; corolla tube inflated at the base
Telosma
27.Corona lobes with an apical tooth projecting horizontally inwards; corolla tube not inflated at the base
Wattakaka
 
 
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