PULSE FAMILY. 117 



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

 nearly straig-ht, 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 3-toothed. Keel oblong, erect. Ovary sessile ; pod 

 ovate-oblong to short linear. Seeds \vith strophiole. Densely spiny shrubs, with 

 yellow flowers In the axils of the upper leaves. 



* » Leaves ^except the uppei-most in No. 9 and one of No. 11) compound. 



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

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

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

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

 shrubb.v plants. 



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

 2 short Ups, the upper lip notched. Keel incurved, not pointed. Ovarj- and flat 

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

 with golden yellow flowers in long, hanging racemes. 



IL LUPINUS. 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-li|)ped. 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. Herbs, never twining or tendril-bearing, with leaves of 3 leaflets (rarely more, 

 but then digitate^ their margiiis commonly more or less toothed uchich is re- 

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

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

 divided across into joints. 



• 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-shaj)ed. 



• • Leaves mostly digitate or palmately Z-foliolate, all {with one exception) borne 



directly on the apex of the common petiole. 



U. TRIFOLIUM. Flowers in heads, spikes, or liead-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. 



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

 not digitate, or even digitately ■'.-foliolate (except in Psoralea), and the leaflet.'; 

 not toothed. .Stipules, except in Nos. 23, 2S, and 33, not united with the petiole. 

 (Here might be sought Xo. 51.) 



• Flowers {.small, in spikes or heads) incKstinctly or imperfectly papilionaceous. Pod 



very small and usually remaining closed, only \--2-seeded. Calyx '-toothed, 

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



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



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



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

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



16. DALE.\. Herbs, 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. 



