238 XLVll. ROSACEiE. 



Suborder 3.— M I M O S E tE . 



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



Embryo straight. — Leaves abruptly pinnate or bipinnate. 



38. MIMOSA. 



Gt, /ii/ios, a buiToon ; the leaves seems sporting with the hand that touches them. 



Flowers 9 $ d*- 5 Calyx 5-toothed ; corolla 0, or 5-toothed ; sta. 

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

 without ovaries or fruit. — % Hbs. and shrubs, natives of tropical Avier. 6fc. 



M. puDiCA. Sensitive Plojit. — St. prickly, moi-e or less hispid ; lis. digitate- 

 pinnate ; pinnce 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. Willd. 



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



Flowers $ c? ; calyx minute, 5-toothed ; petals united into a funnel- 

 shaped, 5-cleft corolla; stamens 8 — 10, 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 ; pinna 6 — 8 pairs ; Ifts. numerous, minute, elliptical, 

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

 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 i — h' diam. Ma)- — 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. — '4 Unarmed and gla- 

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

 axillary, pedunculate heads. 



D. BRACHYLOBA. DC. (Dcsmantlius. Benth.) 



a. I'linocnsis. T. & G. (Mimosa Illinoensis. Michx.) Pinnae 6 11 



pairs, with a gland between the lowest pair only ; stems numerous, diffuse ; 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, 2J" by i". Legumes crowded, f long. Jn. Aug. — This genus is reduced 

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

 less important distinctions than this - e. g. Vicia and Lath3'rus. 



Orper XL VIII. ROSACEA. 



Trees, shruis or herhs. Leaves alternate. 



stipules usually large or conspicuous, sometimes none. 



F/s. regular, commonly showy, rarely ditucious. 



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



Cor. — Petals 5, regular, rarely wanting, inserted on the disk which lines the orifice of the ca.]yx. 



Sta. 00, usually numerous, arising from the calyx, distinct. 



Ova. superior, 1 or several, distinct, 1-celled, often coherent to the sides of the calyx and each other. 



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



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

 orders ; viz. Amugdalea, Pomec£ and llosacetB proper, to which is added Chrysobalanete, not representca 

 in this flora. Tne genera and speeies in each suborder are estimated by Lindley as follows : 



Chrysobalaneaj, 11 genera, 50 species. 



Amygdalese, 5 " no "_ 



Pomeoe, 15 " 200 " 



Rosacete proper, 50 " 625 " 



Total, R-J " 9S5 " 



