716 ASCLEPIADEA: (Brown). [ Pachycarpus. 
Corona-lobes erect from a short spreading base, with 
very slight or inconspicuous keels : 
Terminal part of corona-lobes dilated into an 
orbicular-rhomboid or broadly cuneate entire 
or 3-lobed blade, dark chocolate ae ... (2) rigidus. 
Terminal part of corona-lobes dilated into a 
lanceolate to subhastate-lanceolate blade, light 
brown when dried... on ‘ee ..- (10) macrochilus. 
Corona-lobes horizontally spreading, about twice as 
long as deep, narrowly lanceolate, deeply com- 
plicate-boat-shaped from the keels extending to 
the apex .. i ia bee an ... (20) coronarius. 
Corona-lobes consisting of a pair of fleshy keels or a 
deeply fissured hump standing upon a recurved 
spreading base, not prolonged into a blade 
beyond them or only into a small or subulate 
point ; corolla-lobes reflexed or revolute : 
Sepals 34-44 lin. long, about 2 lin. broad, lanceolate 
2 ovate-lanceolate ; corolla-lobes about 7 lin. 
we 6 Fee eae : 
Sepals 6-7 lin. long, 3-34 lin. broad, ovate ; 
corolla-lobes 9-11 lin. long ea we» (7) validus. 
Corona-lobes with a pair of very prominent or large 
contiguous keels or a deeply fissured hump at 
the base and prolonged beyond them into an 
erect spreading or much incurved linear, lanceo- 
late or variably dilated blade : 
Corolla reflexed nearly straight back from the 
base ; terminal part of the corona-lobes dilated 
into a thin lanceolate to suborbicular blade 
(6) inconstans. 
2-4 lin. broad : 
Keels or basal hump on the corona-lobes higher 
than broad viewed sideways eae ... (A) reflectens. 
Keels or basal hump on the corona-lobes broader 
than high viewed sideways... ve ... (5) appendiculatus. 
Corolla reflexed-spreading (not straight back) fro * 
the base ; terminal part of the corona-lobes 
linear or linear-spathulate, 3-1 lin. broad ... (8) scaber. 
Corolla not wholly reflexed ; lobes campanulately 
spreading to slightly incurved, or in 
P. natalensis with the basal half reflexed- 
spreading and the apical half curved upwards, 
sometimes with the tips spreading to revolute : 
Corona-lobes linear, replicate and not dilated 
at the incurved tips, with the rather dwarf 
keels extending from their base to beyond 
the middle and then excurrent at the 
margins we re we wee eee (19) McKenii. 
Corona-lobes with the keels or deeply fissured 
hump rarely extending to the middle 
(usually to 3-3) of the lobe : 
Keels on the corona-lobes subfaleate or 4 
obliquely oblong with their tips directed 
backwards : 
Blade of the corona-lobes 3-lobed, 3-54 lin. 
broad across the side lobes when spread : 
out eer eee eer eee ore (11) vexillaris. 
