a. Leaves broadest towards the apex.
Leaves not impressed-veined above, shining I. Crus-galli.
1 C. Crus-galli.
Leaves impressed-veined above, dull. II. Punctatæ.
Fruit glabrous; calyx lobes entire.
Fruit ellipsoidal; nutlets usually
3 or 4.
Leaves bright yellow-green,
slightly impressed above;
fruit ellipsoidal. 2 C. cuneiformis.
Leaves dull gray-green, strongly
impressed-veined; fruit short
ellipsoidal. 3 C. punctata.
Fruit globose. 4 C. Margaretta.
Fruit villous; calyx lobes
glandular-serrate. 5 C. collina.
b. Leaves broadest at the middle.
Leaves impressed-veined; nutlets deeply
pitted on inner face. III. Macracanthæ.
Leaves dark green, glabrous and shining above, coriaceous.
Fruit sometimes 16 mm. (2/3 inch)
thick; stamens usually 10;
leaves and anthers large. 6 C. succulenta.
Fruit sometimes 12 mm. (1/2 inch)
thick; stamens 15-20; leaves
and anthers small. 7 C. neo-fluvialis.
Leaves gray-green, pubescent and
dull above, subcoriaceous. 8 C. Calpodendron.
Leaves not impressed-veined; nutlets without pits.
Calyx glandular margined, fruit more than
8 mm. (1/8 inch) thick; leaves not
trilobate. IV. Rotundifoliæ.
9 C. chrysocarpa.
Calyx lobes not glandular margined; fruit 4-8 mm.
(1/16-1/8 inch thick); leaves often trilobate
towards the apex. V. Virides.
Fruit bright red, glaucous,
4-6 mm. (1/6-1/4 inch) thick;
leaves serrate. 10 C. viridis.
Fruit dull dark red, 6-8 mm.
(1/4-1/3 inch) thick;
leaves coarsely serrate. 11 C. nitida.