KEY TO SUB-CLASSES, ORDERS AND GENERA, 165 
LXXIV—APOCYNACEA\—cont. 
(**) Disk cupular hiding the ovary; seeds beaked; flowers 
yellowish-white in slender, wide-spreading cymes :— 
dcix—Anodendron. . 
(***) Disk annular, not hiding the ovary; seeds not beaked ; 
flowers white, fragrant, in loose terminzl and pseud- 
axillary cymes :—— ... as ... devili-—Trachelospermus. 
(8) Coroila lobes straight, overlapping to the right, twisted to 
the left in bud :— 
(*) Filaments spirally twisted ; flowers white, in axillary and 
terminal dichotomous cymes or thyrses :-- .... dciv—Parsonia, 
(**) Filaments not twisted ; flowers white, in terminal tomentose 
cymes :— ... ) devi--Aganosma. 
(C) Flowers small, purplish white in paniculate cymes ; follicles very 
slender, almost filiform ; corolla lobes straight, overlapping te the right, twisted 
to the left but with the tip deflected in bud :— rea wee +. dcx-——Ichnocarpns, 
LXXV—ASCLEPIADACE Ai— 
(Anatomical features —-These are precisely the same as in APOCYNACER, q.v. | 
(1) Filaments usually free ; pollen masses granular :— 
(i) Corolla lobes contorted, overlapping to the right :-- 
(1) Leaves alternate, crowded at the ends of branches ; flowers minute 
in terminal dichotomous cymes ; tree :— i “rc ee ... dexv—Utleria, 
(2) Leaves opposite : climbers :—- 
(A) Flowers large, mauve, in terminal 3-chotomous cymes ; corolla 
funnel shaped with campanulate throat :— .. dcxiii--Cryptostegia. 
(B) Flowers yellow, medium sized, rotate, in slender 2-chotomous 
cymes ; corolla lobes linear twisted :— .. dexii—Cryptolepis. 
(C) Flowers small or minute, hairy, rotate:— 
(a) Coronal scales long filiform ; flowers in 3+chotomous panicled 
cymes :—- ee Ase a ae dexvi-—Streptocaulon. 
(b) Coronal scales, short, broad ; flowers in 2-chotomous cymes, 
purple within, green without :—- 7. dcexiv—Brachylepis. 
Gi) Corolla lobes valvate ; leaves opposite : climbers :— 
(1) Corolla lobes glabrous, purple within ; flowers small in subsessile 
opposite crowded cymes :-— ... ae ck a ahs dexi-- Hemidesmus. 
(2) Corolla lobes densely white bearded; flowers small in avillary 
peduncled cymes :— ___.... Sts iy ne see vA ... dexvii-—Decalepis, 
(II) Filaments connate into a staminal tube ; pollen masses waxy, solitary 
in each cell (in pairs on the pollen carriers), or in a few genera (Secamone, Toxo- 
carpus, Genianthus) in pairs in each cell (¢.e., fours on the pollen carriers) :~— 
(i) Corolla lobes contorted, overlapping usually on the right :— 
(1) Corolla rotate :— 
(A) Flowers large (Linch diameter or more), reddish purple and white, 
in axillary few flowered cymes ; corona low, annular, 10-lobed, 
fleshy :—... ve 5s Lu .. dexxvi-—Holostemma. 
(B) Flowers medium-sized :— 
(a) Leafless climber (somewhat resembling Euphorbia Tirucalli) ; 
flowers white or yellow, in terminal (or at the nodes) umbelli- 
form cymes ; corona cupshaped, membranous, 10-lobed or- 
crenate, adnate to the base of the column :— 
dexxvili—Sarcostemma. 
(6) Climbers with ovate-cordate leaves :-— 
(x) Flowers green in umbelliform cymes ; coronal scales fleshy, 
hemispheric, cuspidate, adnate to the column :—- dexxxv--Dregea, 
(8) Flowers greenish speckled with brown in corymbose racemes c 
coronal scales membranous, erect, bifid :-- 
dexxxiv-—Cosmostigma, 
(C) Flowers small or minute (4 inch diameter or less); climbers with 
opposite leaves :—— / 
(a) Flowers in axillary 2-or 3- chotomous cymes ; coronal scales 5, 
laterally compressed, adnate to the staminal tube, tips free :— 
dexviii—Secamone. 
