238 XL VII. ROSACE^E. 



SUBORDER 3. M I M O S E M . 



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



Embryo straight. Leaves abruptly pinuate or bipinnate. 



38. MIMOSA. 



Gr. ^t//o, a buffoon ; the leaves seems sporting with' the hand that touches them. 



Flowers 9 $ <?. Calyx 5-tpothed ; corolla 0, or 5-toothed ; sta. 

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

 without ovaries or fruit. *4 Hbs. and shrubs, natives of tropical Amer. fyc. 



M. PUDICA. Sensitive Plant. St. prickly, more or less hispid ; Irs. 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. Willd. 



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



Flowers & ; calyx minute, 5-toothed ; petals united into a funnel- 

 shaped, 5-cleft corolla; stamens 8 10,distinctor 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 ; 'pinnae, 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 4f long, and with the petioles and peduncles armed 

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

 cles 2 3' long, heads i ' 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 and gla- 

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

 axillary, pedunculate heads. 



D. BRACHYLOBA. DC. (Desmanthus. Benth.) 



a. Illinoensis. T. & G. (Mimosa Illinoensis. Michx.} Pinna 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, 2$" by $". 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 XL VIII. ROSACES. 



Trees, shrubs or herbs. Leaves alternate. 



Stipules usually large or conspicuous, sometimes none. 



Fls. regular, commonly showy, rarely dioecious. 



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



Car. Petals 5, regular, rarely wanting, inserted on the disk which lines the orifice of the calyx. 



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



Ova. superior, 1 or several, distinct, l-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. AmygdalecE,, Pomece and Rosacea proper, to which is added Chrysolalanea, not represented 

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



Chrysobalaneae, 11 genera, 50 species. 



Amygdalese, 5 110 



Pomeae, 16 200 



Rosacese proper, 50 625 



Total, 82 " 985 " 



