PULSE FAMILY. 117 



7. GENISTA. Leaves entire ; stipules very minute or none. Calyx 5-cleft. Keel oblong, 



nearly straight, blunt, turned down when the flower opens. Pod mostly flat. Low 

 shrubby plants. 



8. ULEX. Leaves reduced to a thorn-like petiole or sharp scale ; stipules 0. Calyx 2- 



parted, upper segment 2- lower 8-toothed. Keel oblong, erect. Ovary sessile ; pod 

 ovate-oblong to short linear. SeedB with strophiole. Densely spiny shrubs, with 

 yellow flowers in the axils of the upper leaves. 



* * Leaves (except the uppermost m No. 9 and one of No. 11) compound. 

 9, CYTI8US. Leaves of 1 or 3 leaflets, or the green branches sometimes leafless ; stipules 

 minute or wanting. Calyx 2-Iipped or 5-toothed. Keel straight or somewhat curved, 

 blunt, soon turned down. Style incurved or even colled up after the flower opens. 

 Pod flat. Seeds with a fleshy or scale-like appendage (strophiole) at the scar. Low 

 shrubby plants. 



10. LABURNUM. Leaves of 3 leaflets ; stipules inconspicuous or wanting. Calyx with 



2 short lips, the upper lip notched. Keel incurved, not pointed. Ovary and flat 

 pod somewhat stalked into the calyx. Seeds naked at the scar. Trees or shrubs, 

 with golden yellow flowers in long, hanging racemes. 



11. LUPINU8. Leaves of several leaflets, in one species simple ; stipules adherent to the 



base of the petiole. Flowers in a long, thick raceme. Calyx deeply 2-lipped. Corolla 

 of peculiar shape, the sides of the rounded standard being rolled backwards, and the 

 wings lightly cohering over and inclosing the narrow and incurved scythe-shaped or 

 sickle-shaped keel. Pod flat. Mostly herbs. 



§ 2. Serbs, never tiovnmg or tendril-bearing, with leaves of 3 leaflets (rarely more, 

 but then digitate), their margins commonly more or less toothed (which is re- 

 markable in this family) ; stipules conspicuous and united with the base of the 

 petiole (Lessons, p. 66, Fig. 177) ; stamens diadelphous; pod 1-few-seeded, never 



divided across into joints. _ 



w 



* Leaves pinnately S-foliolate, as is seen by the end leaflet being jointed with the com- 



mon petiole above the side leaflets. 



12. MELILOTUS. Herbage sweet-scented. Flowers small, in slender racemes. Corolla 



as in Medicago. Pod small, but exceeding the calyx, globular, wrinkled, closed, 1-2- 

 seeded. 



13. MEDICAGO. Flowers small, in spikes, heads, etc. Corolla short, not united with the 



tube of stamens. Pod curved or coiled up, at least kidney-shaped. 



* * Leaves mostly digitate or palmately S-foliolate, all (with one exception) borne 



directly on the apex of the common petiole. 



14. TEIFOLIUM. Flowers in heads, spikes, or head-like umbels. Calyx with slender or 



bristle-form teeth or lobes. Corolla slowly withering or becoming dry and permanent 

 after flowering ; the claws of all the petals (except sometimes the standard) more or 

 less united below with the tube of stamens or also with each other. Pod small and 

 thin, single-few-seeded, generally included in the calyx or the persistent corolla. 



§ 3. Serbs or woody plants, often twining but never tendril-bearing, with the leaves 

 not digitate, or even digitately S-foliolate (except in Psoralea), and the leaflets 

 not toothed. Stipules, except in Nos. 23, 28, and 33, not united with the petiole. 

 (Sere might be sought No. 51.) 



* Flowers (small, in spikes or heads) indistinctly or imperfectly papilionaceous. Pod 



very small and usually remaining closed, only l-2-seeded. Calyx 5-toothed, 

 persistent. Leaves odd-pinnate, mostly dotted with dark spots or glands. 



+- Petals 5, on very slender claws ; stamens monadelphous in a split tube. 



15. PETALOSTEMON. Herbs, with crowded leaves. Four petals Blmilar, spreading, 



borne on the top of the tube of the stamens ; the fifth (answering to the standard) 

 rising from the bottom of the calyx, and heart-shaped or oblong. Stamens only 5. 



16. DALEA. HerbB, as to our species. Flowers as in the last, but rather more papiliona- 



ceous, 4 of the petals borne on the middle of the tube of 10 stamens. 



