238 XLVJi. ROSACE.-i:. 



Suborder 3.— M I M O S E .«: . 



Sepals and petals valvate in aestivation, subregular. Stamens 5 — 200. 



Embryo straight. — Leaves abruptly pinnate or bipinnate. 



38. MIMOSA. 



Gr. fiifios, a buffoon ; the leaves seems sporting with the hand that touches them. 



Flowers 9 5 cJ*- i Calyx 5-toothed ; corolla 0, or 5-toothed ; sta. 

 4 — 15 ; legume separated into 1 -seeded joints ; cf like tbe perfect, but 

 without ovaries or fruit. — % Hhs. and shrubs^ natives of tropical Amer. 6fC. 



M. puDiCA. Sensitive Plant. — St. prickly, more or less hispid ; Zrs. digitate- 

 pinnate ; pinna: 4, of many (20 or more) pairs of linear leaflets. — Native of Bra- 

 zil. Stem shrubby, about a foot high. Leaflets about 3" long, very numerous. 

 Flowers small, capitate. — It is occasionally cultivated for the interest excited 

 by its spontaneous motions, — the leaves bending, folding, and apparently shrink- 

 ing away from the touch of the hand. 



39. SCHRANKIA. VVilld. 



In honor of Francis ile Paula Schrank, a German botanist. 



Flowers $ d" : calyx minute, 5-toothed ; petals united into a funnel- 

 shaped, 5-cleft corolla; stamens 8 — 1 0.distinct or monadelphous; legume 

 echinate, dry, 1-celled, 4-valved, many-seeded; — % Prickly herbs. St. 

 procumbent. Lvs. sensitive., bipinnate. Fls. in spherical heads., purplish. 

 S. UNCiNATA. Willd. (Mimosa horridula. Michx.) Sensitive Brier. 

 St. angled, grooved; pimm 6 — 8 pairs; Ifts. numerous, minute, elliptical, 

 reticulated beneath; hds. solitary, on peduncles shorter than the leaves; leg. 

 very densely clothed with prickles. — Dry soils, Clark Co., Mo. Mead, and 

 Southern States. Stem 2 — if long, and with the petioles and peduncles armed 

 with short, sharp prickles turned downwards. Leaflets about 2" by ^". Pedun- 

 cles 2—3' long, heads \—\' diam. May— Jl. 



40. DARLINGTONIA. DC. 



In honor of Hon. Wm. Darlington, of Penn., author of Flora Cestrica, &c. 



Flowers $ ; calyx campanulate, 5-toothed ; petals 5, distinct ; sta- 

 mens 5, distinct ; style filiform ; stigma minute, funnel-shaped ; 

 legume lanceolate, dry, 2-valved, 4 — 6-seeded. — % Unarmed ajid gla- 

 brous herbs. Lvs. abruptly bipinnate ; Ifts. very. numerous. Fls. white, in 

 axillary., pedunculate heads. 



D. BRACHYLOBA. DC. (Desmauthus. Benth.) 



a. Illinoensis. T. & G. (Mimosa Illinoensis. Michx.) Pinnce 6 — 11 

 pairs, with a gland between the lowest pair only ; stems numerous, diff'use ; leg. 

 .slightly falcate. — Prairies and bottoms, 111. to La. Stems 2 — 3f high, simple, 

 striate. Leaves 2 — 4' long. Leaflets linear-oblong, subfalcate, obtuse at each 

 end, 2^" by I". Legumes crowded, f ' long. Jn. Aug. — This genus is reduced 

 by Bentham to Desmanthus, Willd., but there are numerous genera based on 

 less important distinctions than this ; e.g. Vicia and Lathyrus. 



Order XLVIII. ROSACEA. 



Trf.es, shrubs or herbs. Leaves alternate. 



Stipules usually large or conspicuous, sometimes none. 



Fls. regular, commonly showy, rarely dia'cious. 



Qa! —Sepals 5, rarely fewer, united, often reinforced by as many bracts. 



Cor.—Pcta.]s 5, regular, rarely wanting, inserted on the disk which lines the orihce of the calyx. 



Sta 00, u.«ually numerous, arising from the calyx, distinct. ., , , j u .■- 



Ova. superior, 1 or several, distinct, 1-celled, often coherent fo the sides of the caly.\ and each other. 



Styles distinct or united. Fridt a drupe, pome, achenia or follicle. 



This order, as here constituted, consists of three suborders, which by Lindley are regarded as separate 

 orders • viz Amys-dalece. Pomecc and Rosacea proper, to which i.-s added ChrystobalanecE, not represented 

 in this 'flora. The genera and species in each suborder are estimated by Lindley as follows : 



Chrysobalanea;, 11 genera, 50 species. 



AmysdaleSB, 5 " 110 



Pomes, 16 " 200 ^^ 



Rosaccte proper, 50 " 625 



Total, S2 " 9M 



