Order XXIII. CELASTRACEÆ.
1. Econyums. The only British genus.
Order XXIV. RHAMNACEÆ.
1. Rhamnus. The only British genus.
Order XXV. LEGUMINOSÆ
* Stamens all united by their filaments.
1. Ulex. All the branches spinous. Leaves minute. Calyx with 2 bracts at the base. Sepals nearly as long as the corolla. Standard bifid.
2. Genista. Flowering branches not spinous. Calyx without bracts, much shorter than the corolla, 3-cleft. Standard entire.
3. Cytisus. Calyx much shorter than the corolla, without bracts, 2-lipped, the lower lip with 3 teeth. Standard large, ovate. Pod flat.
4. Ononis. Calyx much shorter than the corolla, 5-cleft. Leaves simple or ternate.
5. Anthyllis. Calyx much shorter than the corolla, 5-cleft. Leaves pinnate.
** One stamen distinct, the rest united.
6. Medicago. Pod sickle-shaped, or spirally curved. Leaves ternate.
7. Melilotus. Pod nearly straight. Calyx-teeth 5, nearly equal. Keel blunt. Leaves ternate. Petals deciduous.
8. Trifolium. Pod nearly straight. Calyx-teeth 5, unequal. Petals slightly connected, persistent; keel blunt. Leaves ternate.
9. Lotus. Pod nearly straight. Calyx-teeth nearly equal. Keel with a narrow point. Leaves ternate.
10. Oxytropis. Pod nearly 2-celled. Keel with a narrow point. Leaves pinnate.
11. Astragalus. Pod nearly 2-celled. Keel obtuse. Leaves pinnate.
12. Ornithopus. Pod compressed, curved, jointed. Leaves pinnate.
13. Hippocrepis. Pod compressed, formed of crescent-shaped joints. Leaves pinnate.
14. Onobrychis. Pod 1-seeded, toothed on the lower margin. Leaves pinnate.
15. Vicia. Pod 1-celled, many-seeded. Style filiform, hairy beneath the stigma. Leaves pinnate, with tendrils.
16.Ervum. Pod 1-celled, with several seeds. Stigma downy all over. Leaves pinnate, with tendrils.
17. Lathyrus. Pod 1-celled, many-seeded. Style flat, dilated upwards, downy in front. Leaves pinnate or simple, sometimes with tendrils.
19. Pisum. Pod 1-celled, many-seeded. Style compressed, keeled, somewhat triangular, downy above. Leaves pinnate, with tendrils.
20. Orobus. Pod 1-celled. Style flat, downy on the upper side. Leaves pinnate, without tendrils.
Order XXVI. ROSACÆ.
1. Prunus. Fruit a drupe. Ovary superior, of 1 carpel. Calyx deciduous.
2. Spiræa. Fruit formed of several follicles, arranged in a ring upon the calyx-tube.
3. Dryas. Carpels with a feather-like awn. Disk flat.
4. Geum. Carpels with a feather-like jointed awn. Disk elongated.
5. Rubus. Fruit formed of a number of drupes, in a simple calyx.
6. Fragaria. Fruit formed of carpels on a fleshy receptacle, falling when ripe. Calyx double.
7. Comarum. Carpels on a spongy persistent receptacle. Calyx double. Petals smaller than the calyx.
