22 ' xcv. ASCLEPIABEJ). (J. D. Hooker.) IGynanchum.- 



gate, moderately ventricose, smooth (in C. corymboswm densely clothed with 

 soft spines). Seeds comose. — Distkib. Species about 100; tropical and tem- 

 perate. 



I cannot retain Vinoetoxicum as distinct from Cynanchum; the presence or 

 ahsence of processes or scales within the corona affords no character (see C. acutum). 

 The corona itself affords very inconstant characters even for many of the species. 



* Stem erect. Corona simple, 5-lohed or -partite, lobes without internal 

 processes. 



1. C Vincetozicum, Pers. ; pubescent or glabrate, leaves broadly 

 cordate or ovate acute, cymes sessile or peduncled, flowers corymbose or pani- 

 culate, corolla yellow, segments glabrous or nearly so, coronal-lobes triangular 

 oblong or rounded. C. Kenouriense, Wight Contrib. 58. Vincetoxicum 

 ofBcinale, Moench; Boiss. Fl. Orient, iv. 54; Dene, in DC. Prodr. viii. 524. 

 V. Kenouriense, Dene. I.e. 525. Asclepias Vincetoxicum, Linn. 



Temperate Himalaya; from Kashmir to Sikkim, alt. 7-11,000 ft. — Distkib. 

 Westwards to Norway and Spain. 



Stem 6-10 in., and leaves beneath usually pubescent, sometimes glabrous; leaves 

 broader, greener, shorter petioled and less coriaceous than in the two following species. 

 The coronal-lobes are very variable indeed. 



2. C. grlaucum, WaU. in Wight Contrib. 58; erect, hoary or puberu- 

 lous pale or glaucous, leaves ovate oblong lanceolate or cordate, cymea usually 

 sessile, flowers umbelled, corolla yellow segments hirsute or bearded within, 

 coronal-lobes 5 rounded broader than long fleshy. WaU. Cat. 8229. Vince- 

 toxicum canescens, Dene, in DC. Frodr. viii. 523 ; Boiss. Fl. Orient, iv. 52. 



Temperate Himalaya, from Nepal Westwards, alt. 5-9000 ft. Western Tibet, 

 alt. 10-12,000 ft. — DiSTRiB. Afghanistan and westward to the Greek Archipelago. 



Stem 6-18 in., erect, flexuous ; rootstock with dense fascicles of roots as in C. 

 Vincetoxicum. ieawes 1-3 by 1^-2^ in., extremely variable in length and breadth, 

 coriaceous, acute acuminate or apiculate, nerves very oblique ; petiole ^J in. Ci/mes 

 pubescent, few or many-fld. ; pedicels short. Corolla J in. diam., very variable in 

 size, segments subacute. Coronal-lobes variable. Follicles 2-4 in., slender. Seeds 

 ^-| in. long, broadly ovoid, concavo-convex. — Boissier says that C. glaucum differs 

 from canescens in the narrower leaves, few-fld. cymes, and smaller corolla with ovate 

 segments, but none of these characters hold good. In some Tibetan specimens the 

 coronal-lobes are narrow, and the filaments form a rather long column. 



3. C. Amottianum, Wight Contrib. 58 ; erect, puberulous or hoary, 

 leaves ovate oblong or lanceolate, cymes sessile, corolla dark purple, segments 

 hirsute or bearded within, coronal-lobes 5 fleshy oblong or rounded. Vince- 

 toxicum Amottianum, Wight le. t. 1614 ; Dene, in DC. Prodr. viii. 523; Boiss. 

 Fl. Orient, iv. 52. V. montanum. Dene. I. c. 525. V. luridum. Stocks mss. 



Western Himalaya; Kashmir, alt. 6-8900 ft., Sot/le, &c.— Disteie. Belu- 

 chistan. 



Habit and foliage of C. glauoum, with the leaves sometimes whorled, and smaller 

 dark purple flowers. I suspect that it is only a variety of that plant, and both of 

 C. Vincetoxicum. 



** Stem twining. OoroUa glabrous. Corona without internal processes, 

 t Peduncle of cyme short. 



4. C. ovalifolium, WigJtt Contrib. 57; twining, glabrous, leaves 

 elliptic or oblong acuminate base rounded or subacute, peduncles short, flowers 

 racemose or panicled, corona short irregularly toothed, teeth often curved. 



