152 



ASCLEPIADE^E. LXII. CYNANCHUM. 



5. Stamineous corona deeply 5-cleft ; segments opposite the 

 anthers, furnished each with a parallel segment inside. Pollen 

 masses fixed by their apexes, or beneath them. 



25 C. AURICULA'TUM (Royle, ex Wight, contrib. ind. bot. p. 

 58.) twining ; leaves cordate-ovate, acuminated, ciliated, auri- 

 cled at the base ; umbels cyme-formed, on long peduncles, few- 

 flowered; corolla 5-parted ; corona deeply 5-cleft: segments 

 obtuse, exceeding the gynostegium, furnished each with a little 

 parallel segment inside. T? . ^. F. Native of Kinour and 

 Kaniaon. Wall. ascl. no. 137. 



Auricled Cynanchum. Shrub twining. 



26 C. ROYLEI (Wight, 1. c.) twining?, downy; leaves broad- 

 cordate at the base, and auricled, gradually tapering into a 

 subulate apex ; umbels on long peduncles, many- flowered ; co- 

 rolla 5-cleft ; corona deeply 5-cleft : segments obtuse, about 

 equal to the gynostegium, furnished each with a small parallel 

 segment, inside. Ij . *"\ F. Native of Kinour, Royle. 



Royle's Cynanchum. Shrub twining. 



6. Stamineous corona tubular, inclosing the gynostegium ; with 

 a 10-cleft border; without any segments or carinae inside. 

 Stigma terminated by an entire point. Stems erect. 



27 C. ROSEUM (R. Br. in mem. wern. soc. 1. p. 47.) leaves 

 lanceolate-linear, undulated, smoothish ; pedicels and calyxes 

 pilose; corona 10-cleft; stigma entire. I/. H. Native of 

 Dahuria, among rocks. Asclepias Dahurlca, Willd. spec. 1. p. 

 1272.? Gmel. sib. 4. p. 78. t. 42. Root thick, sweet, creep- 

 ing. Flowers beautiful, purple. 



./fcwe-coloured-flowered Cynanchum. Fl. July, Aug. Clt. 

 1818. PI. 1 to lifoot. 



28 C. ORIENTALS (Willd. herb, ex Spreng. syst. 1. p. 851.) 

 herbaceous, twining; leaves deeply-cordate, oblong, acute, gla- 

 brous, as well as the umbels and peduncles. T . ^. H. Native 

 of Asia Minor. 



Eastern Cynanchum. PI. twining. 



7. Stamineous corona saucer-shaped, fleshy, 5-lQ-lobcd, simple 

 inside. Pollen masses Jlxed beneath their apexes. Stigma ter- 

 minated by an entire, very short point. Follicles smooth. 

 Stems erectish, or twining a very little. 



29 C. VINCETOXICUM (R. Br. in mem. wern. soc. 1. p. 47.) 

 stems erect ; corollas beardless ; umbels simple ; pedicels 8 

 times longer than the peduncle ; corona 5-lobed. I/ . H. Na- 

 tive of Europe, in gravelly places, between the 59 and 40 

 of latitude, as well as of Sweden, Denmark, &c. &c. Asclepias 

 vincetoxicum, Lin. spec. p. 314. Willd. spec. 1. p. 1268. 

 Oed. fl. dan. t. 849. Heyne, term. bot. t. 42. f. 3. Schkuhr. 

 handb. t. 55. Bull. herb. t. 96. Plenck, icon. t. 154. Jaume, 

 St. Hil. 21. t. 6. Ludw. eclyp. t. 25. Asclepias alba, Mill, 

 diet. no. 1. fig. t. 53. Vincet6xicum officinale, Mcench. meth. 

 p. 317. Stem furnished with a downy line on each side. 

 Leaves ovate, acuminated, finely ciliated on the edges when 

 young. Corollas white. 



Var. ft, minus ; all parts of the plant are one half smaller 

 than those of the species. I/ . H. 



Vincetoxicum Cynanchum. Fl. May, Aug. Clt. 1596. PI. 

 1 to 3 feet. 



30 C. LU'TEUM (Spreng. syst. 1. p. 852.) erect, glabrous; 

 leaves ovate, nearly sessile, rather fleshy, veiny; umbels axillary ; 

 corolla coriaceous, with bearded edges. I/ . H Native of 

 Crete, Sieber. Flowers yellow. 



Yellow-fiowered Cynanchum. PI. 



SIC. ME'DIUM (R. Br. 1. c. p. 48.) stems twining at tops ; 

 corollas beardless ; umbels often divided ; pedicels hardly 

 longer than the peduncle; corona 5-lobed. "%. H. Native 



country unknown. Asclepias media, Hort. Allied to the C. 

 nigrum. 



Intermediate Cynanchum. Fl. May, Aug. Clt. ? PI. 2 to 3 

 feet. 



32 C, ? viLi,6suM (Schultes, syst. 6. p. 103.) leaves ovate- 

 oblong, villous beneath, undulated ; lower ones cordate ; um- 

 bels erect, simple ; corollas bearded. 3. H. Native country 

 unknown. Asclepias villosa, Willd. enum. 1. p. 278. Balb. 

 misc. 15. t. 4. Flowers white.? 



bilious Cynanchum. Fl. Ju. Aug. Clt. 1821. PI. 2 to 3 feet. 



33 C. NIGRUM (R. Br. 1. c. p. 48.) stems twining at tops ; co- 

 rollas bearded ; umbels simple ; pedicels hardly longer than the 

 peduncles; corona semi- 10-cleft. 1. H. Native of the south 

 of Europe. Sims. bot. mag. 2390. Asclepias nigra, Lin. spec, 

 p. 315. Willd. spec. 1. p. 1269. Leaves ovate-lanceolate, 

 acuminated, finely ciliated on the edges, narrower than those of 

 C. vincetoxicum. Flowers brown. 



/J/acA-flowered Cynanchum. Fl. July, Aug. Clt. 1596. 

 Fl. 2 to 3 feet. 



34 C. MELA'NTHOS (Hort. par. ex Poir. suppl. 2. p. 430.) 

 stems twining at tops, rather hairy ; leaves ovate-cordate, acute, 

 rather downy: with rounded, closed lobes. 1. H. Native 

 country unknown. Flowers dark purple. 



Black-flowered Cynanchum. Fl. July, Aug. Clt. 1818. 

 PI. 2 to 3 feet. 



35 C. FUSCA'TUM (Link. enum. 1. p. 250.) stems twining at 

 tops; corolla bearded ; umbels simple. l/.H. Native of the 

 south of Europe, as of Spain. Asclepias fuscata, Willd. 

 enurn. suppl. p. 29. Horn. hort. hafn. suppl. 29. C. vin- 

 cetoxicum, ft, Schultes, syst. 6. p. 104. Asclepias lutea, Mill, 

 diet. Flowers yellow. This is intermediate between the C. 

 vincetoxicum and C. nigrum, but is more nearly allied to the 

 latter. 



Brvrvnish-fiov/ered Cynanchum. Fl. July, Aug. Clt. 1817. 

 PI. 2 to 3 feet. 



8. Stamineous corona deeply 5-cleft ; segments simple. Pollen 

 masses fixed beneath their apices. Decumbent or erect plants, 

 sometimes twining a little. Umbels sessile, or nearly so. 



36 C. GLAU'CUM (Wall. ascl. no. 133. Wight, and Arnott, 

 contrib. ind. bot. p. 58.) herbaceous, erect, glabrous or downy ; 

 stems rather compressed, and rather angular ; leaves broad- 

 ovate, or oblong-oval or lanceolate, obtuse, pale glaucous be- 

 neath ; umbels almost sessile ; corolla 5-cleft : segments hairy 

 inside; corona deeply 5-cleft : segments obtuse ; pollen masses 

 fixed beneath their apexes; stigma obtuse, apiculated. 1{. H. 

 Native of Nipaul. 



Var. a, latifblium (Wight, contrib. ind. bot. p. 58.) leaves 

 broad-ovate, obtuse ; umbels many-flowered. If. H. Native 

 of Nipaul. C. glaucum, Wall, asclep. no. 133. 



Var. ft, oblongifolium (Wight. 1. c.) leaves oblong-oval; um- 

 bels few-flowered. 1. H. Native of Nipaul. Wall. ascl. no. 

 132, unnamed. 



Var. y, lanceolatum (Wight, 1. c.) leaves oblong-lanceolate, 

 obtuse; umbels sessile, many-flowered. I/ . H. Native of the 

 Peninsula of India, and at Simla. Wight, cat. no. 1554. Wall, 

 ascl. no. 134, unnamed. 



Glaucous Cynanchum. PI. 2 to 3 feet. ? 



37 C. KINOURIE'NSE (Wight, contrib. ind. bot. p. 58.) herba- 

 ceous, erect; stems and petioles hairy ; leaves oval, cuspidate, on 

 short petioles, downy above towards the margins, and on the nerves 

 and veins, hairy beneath on the nerves, which are conspicuous, 

 and veins ; umbels few-flowered : corona deeply 5-cleft, equal 

 to the gynostegium ; segments obtuse, separated by broad re- 

 cesses ; pollen masses fixed by their apexes ; stigma obtuse. J/ . 



