ASCLEPIADE.E. LXII. CYNANCHCM. 



151 



well as the umbels, glabrous ; segments of corolla elongated and 

 spreading ; alternate teeth of corona shorter. If . / ^ > . S. Native 

 of Montevideo. 



Montevideo Cynanchum. PI. twining. 



15 C. MUCROXA V TCM (H. B. et Kunth, nor. gen. amer. 3. p. 



203. t. 335.) twining; branches furnished with 2 rows of down ; 

 leaves oblong, cuspidately-mucronate, acute at the base, gla- 

 brous ; umbels almost sessile ; calyxes glabrous ; corona 5- 

 parted, with ovate segments, which are ligulate at the apex, al- 

 ternating with the segments of the corolla ; stigma terminated 

 by an emarginate tubercle. Ij . / *\ S. Native of New Granada, 

 on the declivities of Mount Avila. Leaves 8-9 lines long. Co- 

 rolla white, glabrous, with obliquely-oblong acute segments, 

 having the middle nerve green. 



J/urronale-leaved Cynanchum. Shrub twining. 



16 C. MICROPHT'LLUM (H. B. et Kunth, nov. gen. amer. 3. p. 



204. t. 204.) twining ; branches furnished with 2 rows of down ; 

 leaves ovate, acute, mucronate, rounded at the base, glabrous ; 

 flowers solitary, twin or tern, or by fours ; calyxes glabrous ; 

 corona 5-parted, with emarginately-bidentate, concave segments, 

 alternating with the lobes of the corolla ; stigma terminated by 

 an emarginate tubercle. t? . ^. S. Native of New Granada, 

 in frigid places, near the town of Pasto. Leaves very small. 

 Petioles furnished with interpetiolar cilia. Corolla white, ro- 

 tate, with obliquely ovate, acute segments. 



Small-leaved Cynanchum. Shrub twining. 



17 C. SERPYLLIFOLIUM (H. B. et Kunth, nov. gen. amer. 3. 

 p. 205.) twining ; branches marked by a downy line ; leaves 

 ovate-oblong, acuminated, rounded at the base, ciliated a little ; 

 umbels sessile ; calyx rather pilose ; corona 5-parted : with the 

 segments bifid at the apex; stigma convex, emarginate ?. Ij . 

 *^. S. Native near Quito, in shady places ; and on the declivities 

 of Mount Pichincha. Very like C. microphylla, but is larger, in 

 the leaves and flowers : and also differs in the flowers being um- 

 bellate, in the structure of the corona and gynostegium. Corolla 

 campanulate, white, with ovate-oblong, hardly oblique segments. 



Wild Thyme-leared Cynanchum. Shrub twining. 



3. Stamineous corona tubular, mith a 5-\0-cleft border, inclos- 

 ing the gynostegium ; inner segments or carinae wanting. Pol- 

 len masses usually jixed by their apexes. Stigma terminated 

 by a bifid point. Stems twining. Leaves sub-cordate. 



18 C. PAUCIFLORCM (R. Br. in mem. wern. soc. 1. p. 45.) 

 twining, glabrous ; leaves ovate, acuminated, reniformly cordate 

 at the base : the auricles diverging ; umbels few-flowered ; pe- 

 duncles shorter than the petioles ; flowers glabrous, on short 

 petioles: corona equal to the corolla, with a 10-cleft, plicate 

 border, naked inside : the lobes opposite the anthers, lanceolate, 

 acuminated, bifid at top, the alternate ones very short, and emar- 

 ginate or truncate ; pollen masses fixed beneath their apexes ; 

 stigma apiculated, obtuse, hardly emarginate. fj . ^\ S. Na- 

 tive of the East Indies, frequent in hedges. Periploca tunicata, 

 Retz, obs. -2. p. 15. Willd. phyt. 1. p. 7. no. 23. t. 5. f. 3. 

 Asclepias tunicata, Roxb. fl. ind. 2. p. 35. mus. ind. or. t. 609. 

 This plant has been removed by Wight, and Arnott, from the 

 section in which Mr. R. Brown placed it. As there are no interior 

 keels, but only folds of the corona, which arise from contractions 

 of its mouth, and disappear when expanded. Follicles ventri- 

 cose. Perhaps this, and C. angustifolium, ought to have been 

 described with 5 lobes to the corona, the alternate ones being so 

 very short. 



Ferr-flowered Cynanchum. Fl. ? Clt. 1820. Shrub twining. 



19 C. WAI.UCHII (Wight, 1. c.) twining, glabrous ; leaves ob- 

 long-ovate, acuminated, cordate at the base, auricled : auricles a 

 little incurved ; corymbs shorter than the leaves, many-flowered ; 

 pedicels equal in length to the peduncles, or exceeding them ; 



corona equal to the corolla, somewhat 10-cleft; the lobes oppo- 

 site the anthers, longer, and bifid ; pollen masses fixed beneath 

 their apexes ; stigma mutic. Ij . < "\ S. Native of the East Indies, 

 at Jentaga and Chuna-Poonjee. Cynanchum, Wall. ascl. no. 80. 

 Very closely allied to C. pauciflbrum. 

 Waltich's Cynanchum. Shrub twining. 



20 C. CALLIALA'XUM (Hamilt. herb. no. 767, ex Wight, and 

 Arnott, contrib. ind. hot. 56.) twining, glabrous ; leaves ovate 

 or oval, acuminated, cordate at the base, with a narrow recess, 

 glaucous beneath ; umbels shorter than the petioles ; pedicels 

 equal to the peduncle in length; corona 10-lobed, almost twice 

 as short as the corolla: die lobes opposite the anthers, bifid at 

 apex : the alternate ones very short ; stigma sub-apiculated, en- 

 tire ; follicles winged. Ij . *"\ S. Native on the banks of the 

 Ganges, and at Colnmala. Wall. ascl. no. 83. C. auriculatum, 

 Hamilt. herb. no. 768. Wall. ascl. no. 85. Periploca tuni- 

 cata, Herb. madr. Wall. ascl. no. 75. b. c. 



Beautiful-iringed-podded Cynanchum. Shrub twining. 



21 C. ALA'TCM (Wight, and Arnott, contrib. ind. bot. p. 57.) 

 twining, smoothish ; leaves of the older branches cordately 

 auricled at the base : of the young floriferous branches, oval, cus- 

 pidate, cordate at the base, or emarginate, glaucous beneath ; 

 umbels about equal in length to the petioles ; pedicels longer 

 than the peduncles ; corona shorter than the corolla, with a cre- 

 nately 10-lobed, truncate border : the alternate lobes rather the 

 smallest ; stigma apiculated, bifid ; follicles flattish on one side, 

 with the angles marginatelv winged. Jj . / "\ S. Native of 

 Coromandel. Wight, cat. no. 1552. Asclepias truncata, Roxb. 

 in herb. Banks. The winged follicles, and truncate corona, will 

 readily distinguish it from all other species of this section. 



11 r inged-fo\l\c\ed Cynanchum. Shrub twining. 



22 C. OVALIFOLIUM (Wight, 1. c.) twining, glabrous; leaves 

 oblong-oval, acuminated ; cymes many-flowered ; peduncles 

 longer than the petioles ; corona about equal in length to the 

 corolla, 10-cleft; stigma apiculated, somewhat emarginate. ^. 

 ^. S. Native of Penang. Cynanchum, Wall. ascl. no. 82. 

 The oval leaves, and cymose inflorescence, readily distinguish 

 this species. 



Oval-leaved Cynanchum. Shrub twining. 



23 C. AXGCSTIFOLIUM (Wight, and Arnott, 1. c.) twining, 

 smoothish ; petioles rather hairy, reflexed ; leaves linear-lanceo- 

 late, cuspidate, more or less cordate at the base ; umbels short, 

 many-flowered ; corona 10-lobed, the lobes opposite the anthers, 

 broadly linear-oval, about equal in length to the corolla ; the 

 alternate ones very short, and inconspicuous, all truncate and 

 emarginate ; stigma apiculated, somewhat emarginate. f; ^. 

 S. Native of Coromandel. Wight, cat.no. 1553. Leaves 3- 

 5 inches long, and 4-6 lines broad. 



Narrow-leaved Cynanchum. Shrub twining. 



4. Gynostegium or column of fructification stipiiate. Stami- 

 neous corona tubular, inserted at the base of the stipe of the 

 gynostegium, 5-cleft, without any segments or inner carinae in- 

 side. To this section, remarkable for the elongation of the torus 

 or stipe of the gynostegium, belong also a species from the 

 Cape of Good Hope. 



24 C. GRACILLIMUM (Wall, asclep. no. 86. Wight, and Arnott, 

 1. c.) twining, glabrous ; branches slender ; leaves cordate, acu- 

 minated, incurvedly auricled at the base ; umbels few-flowered ; 

 peduncles about equal in length to the petioles, but longer than 

 the pedicels ; segments of corolla lanceolate ; stalk of gynoste- 

 gium exceeding the corona, which is 5-cleft, and naked inside ; 

 pollen masses fixed by their apexes ; stigma beaked, equal, 5-fur- 

 rowed, truncate, equal to the membranes of the anthers, fj . / "\ 

 S. Native of the East Indies, at Segaen. Wall. ascl. no. 86. 



Very-slender Cynanchum. Shrub twining. 



