LEGUMINOSAE (PULSE FAMILY) 503 



52. Galactia. Calyx deeply 4-cleft ; the upper lobe broadest and entire. Bract and bractlets 

 • mostly minute and deciduous. 



++ -H- ++ Leaves 1-3-foliolate ; ovules and seeds 1-2 ; flowers yellow. 



53. Rhynchosia. Keel scythe-shaped. Calyx 4-6-parted. Pod short. 



1. ACACIA [Tourn.] MiU. 



Flowers perfect or polygamous, regular, small, capitate or spicate. Sepals 

 4-5, nearly distinct or united into a 4-5-toothed campanulate cup. Petals as 

 many, narrow. Stamens co , exserted. Pod oblong to linear, compressed or 

 turgid. — Shrubs or trees (mostly armed), with bipinnate or (in certain Aus- 

 tralian species) vertically expanded phyllodial leaves. (Ancient Greek name of 

 an Eg}^ptian species.) 



1. A. angustissima (Mill.) Ktze., var. hirta (Xutt.) Robinson. Unarmed 

 hirsute undershrub ; pinnae 8-14 pairs and leaflets mostly 18-40 pairs (both less 

 numerous in young shoots) ; flowers in yellow or salmon-colored paniculate glo- 

 bose heads. (A. hirta Nutt.; A. fiUcioides Trel.) — Dry bluffs, McDonald Co., 

 Mo. (Bush), Kan. {Hitchcock), and southw. — The typical form (Mimosa an- 

 gustissima Mill.) of Mex. has fewer pinnae and more numerous leaflets. 



2. ALBIZZIA Durazzini. 



Flowers perfect or polygamous. Calyx tubular, 5-dentate. Petals united for 

 more than half their length into a tubular somewhat salver-formed corolla. Sta- 

 mens numerous ; the filaments much elongated. Pod narrowly oblong, the 

 valves neither twisted nor elastically spreading. — Unarmed trees with bipinnate 

 leaves. (Dedicated to the Alhizzi, a noble Italian family, one of whom is said 

 to have introduced this genus into European cultivation.) 



1. A. juLiBRissix Durazzini. Flowers in tassel-like clusters at the end of 

 slender naked peduncles. — Frequently cultivated in the Southern States, and 

 locally established as far n. (according to Small) as Va. (Introd. from Asia 

 and Afr.) 



3. DESMAnTHUS Willd. 



Flowers perfect or polygamous, regular. Calyx campanulate, 5-toothed. 

 Petals 5, distinct. Stamens 5 or 10. Pod flat, membranaceous or somewhat 

 coriaceous, several-seeded, 2-valved, smooth. — Herbs, with twice-pinnate leaves 

 of numerous small leaflets, and with one or more glands on the petiole, setaceous 

 stipules, and axillary peduncles bearing a head of small greenish-white flowers. 

 (Name composed of deaix-n, a bundle, and Evdos, flower.) 



1. D. illinodnsis (Michx.) MacM. Nearly glabrous perennial, erect, 

 3-24 dm. high; pinnae 6-15 pairs; leaflets 20-30 pairs; peduncles 2.5-7.5 

 cm. long ; stamens 5 ; pods numerous in dense globose heads, oblong or lanceo- 

 late, curved, scarcely 2.5 cm. long, 2-6-seeded. (Mimosa Michx. ; Acuan Ktze.; 

 D. brachylobus Benth.) — Prairies and alluvial banks, O. and Ky. to S. Dak., 

 Mo., Tex., and Fla. 



4. SCHRAnKIA Willd. Sensitive Brier 



Flowers polygamous, regular. Calyx minute, 5-toothed. Petals united into 

 a funnel-form 5-cleft corolla. Stamens 10-12. distinct, or the filaments united 

 at base. Pods long and narrow, rough-prickly, several-seeded, 4-valved, i.e. 

 the two narrow valves separating on each side from a thickened margin. — Per- 

 ennial herbs, nearly related to the true Sensitive Plants (Mimosa) ; the pro- 

 cumbent stems and petioles recurved-prickiy, with twice pinnate sensitive leaves 

 of many small leaflets, and axillary peduncles bearing round heads of small rose- 

 colored flowers. (Named for Franz von Paula von JSchrank, a German botan- 

 ist, 1747-1835.) Morokgia Brittou. 



