ORDER 33. ZYGOPHYLLACEJE. 279 



17 P. radula A. Los. palmate, rough, lobes narrow, pinnatifid, revolute at edge, 

 with linear segments ; umbels few-flowered ; nectary nearly as long as the calyx. 

 Distinguished for its large rough leaves deeply divided into linear segments, and 

 and with a mint-like fragrance. Fls. purple. 



18 P. qnercifdlium A. OAK-LEAVED GERANIUM. Los. cordate, pinnatifid 

 with rounded recesses, lobes obtusely crenate; branches and petioles hispid. 

 Lvs. rough, often spotted. Fls. purplish. 



Obx. The above are among the more distinguished and popular species of this vast and 

 favorite genus. Innumerable varieties produced from seeds and propagated by cuttings are 

 equally common and often of superior beauty. No genus seems to be regarded with so universal 

 favor for greenhouse plants as this. The species and their multitudes of hybrid creations, pro- 

 duced by modern ingenuity, are cultivated with assiduous attention by "nearly every lamily 

 which makes the least pretensions to taste throughout the civilized world. 



ORDER XXXII. OXALIDACEJE. WOOD SORRELS. 



Stems low, herbaceous, with an acid juice and alternate compound leaves. Flow*' 

 era regular, symmetrical, hypogynous, 5-merou?. Sepals persistent, imbricated; 

 petals convolute in aestivation. Stamens 10, somewhat monadelphous, those oppo- 

 site the petals longest Styles 5, separate ; capsule 5-celled, several-seeded ; seeds 

 albuminous. (Illust. in Figs. 59. 64, 585.) 



Genera 1, xpecies 328, inhabiting the hot and the temperate regions. The most noticeable 

 property of the Order is the so 

 for the beauty of their flowers. 



. 

 sour j uice, containing oxalic acid. Several species are cultivated 



OXALIS, L. WOOD SORREL. (Gr. <5|^, sour.) Sepals 5, distinct 

 or united at base ; petals much longer than the calyx ; styles 5, capi- 

 tate ; capsule oblong or sub-globous : carpels 5, 1 to several-seeded. 

 Mostly y, with trifoliate Ivs. and inversely heart-shaped leaflets. 



1 O. Acetosella L. Acaukscent scope longer than the leaves, l-fl&vered ; Ifta 

 broad-obcordate with rounded lobes ; sty. as long as the inner etamens ; rt. den- 

 tate, scaly. Woods and shady places, Can. and Northern States. Lvs. palmately 

 3-foliate, on long, weak stalks, purplish beneath. Ped. longer tlian the leaves, 

 each with a nodding, scentless flower whose petals are white, yellowish at the base, 

 delicately veined with purple. The whole plant has an agreeable acid taste. Jn. 



2 O. violacea L. Acaulescent, smooth ; scape umbeliftrous pedicels, subpubes- 

 cent; fls. nodding; tips of the calyx fleshy; sty. shorter than the outer sta- 

 mens. An elegant species ia rocky woods, etc., throughout the D. S. Bulb 

 scaly. Scape nearly twice longer than the leaves, 5 to 8' high. Lvs. palmately 

 3-foliate, sometimes none ; Ifts. nearly twice as wide as long, with a very shallow 



' ( sinus at the very broad apex. Umbels of 3 to 9 drooping flowera Petals large, 

 violet-colored, striate. May. 



3 O. stricta L. Caulescent st. branching ; ped. umbeliferoue, longer than the 

 petioles ; sty. as long as the inner stamens. <1) Fields, U. S. and Can., common. 

 It varies in size from 3 to 12', according to the soil St. leafy, round, smooth. 

 succulent. Lvs. palmately 3-foliate, numerous, scattered, on long stalks. Um- 

 bels on long, axillary stalks, mostly much longer than the petioles. Fls. small, 

 yellow, appearing all summer. Capsules sparingly hirsute, with spreading hairs. 

 When the plant is unsupported, it is more or less decumbent, and is the variety 



13. CORNICTTLATA (0. corniculata L). Obs. The species (nearly 300 in number) 

 are all pretty, and many from Europe and Africa are becoming rather common 

 in cultivation. 



ORDER XXXIII. ZYGOPHYLLACE^E. BEAN CAPERS. 



Herbs, shrubs or trees, with leaves opposite, mostly pinnate (not dotted) and 

 stipulate ; flowers 4 or 5-merous, calyx imbricated and corolla convolute in aestiva- 

 tion. Stamens twice as many as petals, hypogynous, distinct, each often with 

 eale. Ovary compound ; fruit and seeds as in Linaceae- 



