. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. Genus i. MIMOSA FAMILY. 331 I. Acacia angustissima (Mill.) Kuntze. Prairie Acacia. Fig. 2429. Mimosa angustissima Mill. Gard. Diet. Ed. 8, no. 19. 1768. Mimosa filiculoides Cav. Ic. i: 55. pi. 7S. 1791. Acacia filicina Willd. Sp. PI. 4: 1072. 1806. Acacia filiculoides Trelease; Branner & Coville, Rep. Geol. Surv. Ark. 1888: Part 4, 178. 1891. A. angustissim
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. Genus i. MIMOSA FAMILY. 331 I. Acacia angustissima (Mill.) Kuntze. Prairie Acacia. Fig. 2429. Mimosa angustissima Mill. Gard. Diet. Ed. 8, no. 19. 1768. Mimosa filiculoides Cav. Ic. i: 55. pi. 7S. 1791. Acacia filicina Willd. Sp. PI. 4: 1072. 1806. Acacia filiculoides Trelease; Branner & Coville, Rep. Geol. Surv. Ark. 1888: Part 4, 178. 1891. A. angustissima Kuntze, Rev. Gen. PI. 3^; 47. 1898. A low thornless shrub, varying from glabrous to hirsute-pubescent. Pinnae of the leaves 2-15 pairs, oblong in outline, 1-2' long; leaflets 10-50 pairs, oblong or linear-oblong, about 2" long, less than 1" wide, obtuse or acute, slightly inequilateral, i-veined; heads globose, many-flowered, axillary, slender- peduncled, 6"-io" in diameter; sepals distinct or nearly so; filaments yellow, 3-4 times as long as the sepals; pod linear, acute, often narrowed at the base, stipitate, mostly straight, l'-2' long, about 3" wide, flat, its valves thin, reticulated, glabrous or pubes- cent, impressed between the seeds. Prairies, plains and bluffs, Missouri and Kansas to Texas, Arizona and Mexico. 2. ALBIZZIA Durazz. Mag. Tosc. 3^: 11. 1772. Unarmed trees, with large bipinnate leaves, widely spreading branches, and perfect or polygamous capitate pink or white flowers, the heads sometimes panicled. Calyx tubular to campanulate, S-lobed. Corolla funnelform. Stamens numerous, longer than the corolla; filaments united near the base of the corolla. Pods linear, flat, 2-valved, the margins of the valves not separating from them. [In honor of Albizzi, an Italian naturalist.] About 50 species, natives of warm and tropical regions of the Old World, the following typical. I. Albizzia julibrissin Durazz. Pink Siris. Silk-tree. F
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