PULSE FAMILY. 99 



5-toothed. Petals 5, the one answering to the standard smaller than the 

 wing-petals and covered by them ; the keel-petals larger, conniving but dis- 

 tinct. Stamens 10, declining with the style. Pod linear-oblong, flat, thin, 

 several-seeded, one edge wing-margined. 



§ 2. Leaves simply abruptly pinnate. Calyx and corolla almost regular. 



51. CASSIA. Flowers commonly yellow. Calyx of 5 nearly separate sepals. 



Petals 5, spreading, unequal (the lower larger) or almost equal. Stamens 10 

 or 5, some of the upper anthers often imperfect or smaller, their cells opening 

 by a hole or chink at the apex. Pod many-seeded. 



§ 3. Leaves, or at least some of them, twice-pinnate. 



52. C.SSALPINIA. Trees or shrubs, chiefly tropical, with mostly showy red or 



yellow perfect flowers. Calyx deeply 5-cleft. Petals 5, broad, spreading, 

 more or less unequal. Stamens 10, declining, along with the thread-shaped 

 style. Pod flat. 

 63. GYMNOCLADUS. Tall, thornless tree, with large compound leaves, no stip- 

 ules, and dioecious or polygamous whitish regular flowers, in corymb-like 

 clusters or short racemes terminating the branches of the season. Calyx 

 tubular below, and with 5 spreading lobes, the throat bearing 5 oblong petals 

 and 10 short stamens, those of the fertile flowers generally imperfect. Pod 

 oblong, flat, very hard, tardily opening, with a little pulp or sweetish matter 

 inside, containing few or several large and thick hard seeds (over ^' in diam- 

 eter); the fleshy cotyledons remaining underground in germination. 



54. GLEDITSCHIA. Thorny trees, with abruptly twice pinnate or some of them 



once pinnate leaves, the leaflets often crenate-toothed, inconspicuous stipules, 

 and small greenish polygamous flowers in narrow racemes. Calyx 3 -5-cleft, 

 the lobes and the 3-5 nearly similar petals narrow and spreading. Stamens 

 3 - 10. Pod flat, very tardily opening, often with some sweetish matter around 

 the 1 - several flat seeds. Cotyledons thin. 



III. MIMOSA FAMILY. Flowers perfectly regular, small, 

 crowded in heads or spikes ; both calyx and corolla valvate in the 

 bud ; and the 4 or 5 sepals usually and petals frequently united 

 more or less below into a tube or cup. Stamens 4, 5, or more, 

 orten very many, usually more conspicuous than the corolla and 

 brightly colored, the long capillary filaments inserted on the recep- 

 tacle or base of the corolla. Embryo of the seed straight. Leave? 

 almost always twice pinnate and with small leaflets, or apparently 

 simple and parallel-veined when they have phyllodia in place of 

 true leaves. The foliage and the pods only show the leguminous 

 character. 



§ 1. Stamens once or hoice as many as the petals, 4 - 10. Ours herbs or nearly so, 

 tvilh rose-colored or lohilish flowers, and leaves of many small leaflets. 



55. MIMOSA. Calyx commonly minute or inconspicuous. Corolla of 4 or 5 more 



or less united "petals. Pod "flat, oblong or linear: when ripe the valves fall out 

 of a persistent slender margin or frame and also usually break up into one- 

 seeded joints. 



56. SCHRANKIA. Calyx minute. Corolla funnel-form, the 5 petals being united 



up to the middle. Stamens 10. Pod rough-prickly all over, long and nar- 

 row, splitting lengthwise when ripe into 4 parts. 



57. DESMANTHUS. Calyx 5-toothed. Corolla of 5 separate petals. Stamens 



5 or 10. Pod flat, smooth, linear or oblong, 2-valved, no persistent margin. 



§ 2. Stamens numerous, or more than 10. Ours all shrubs or trees. 



58. ALBIZZIA. Flowers flesh-color, rose-color, or nearly white; the long stamens 



monadelphous at the base. Corolla funnel-form, the 5 petals united beyond 

 the middle. Pod flat and thin, broadly linear, not opening elastically. 

 Leaves twice pinnate. 

 69. ACACIA. Flowers yellow or straw-color: the stamens separate and very 

 numerous. Corolla of 4 or 5 separate or partly united small petals. Pod 

 various. 



