ORDER 33. ZYGOPHYLLACE^E. 279 



17 P. radula A. Lvs. 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. Els. purple. 



18 P. quercifolium A. OAK-LEAVED GERANIUM. Lvs. cordate, pinnatifid 

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

 Lvs. rough, often spotted. Fls. purplish. 



Obs. The above are among the more distinguished and popular species of this vnst nml 

 favorite genus. Innumerable varieties produced from seeds and propagated bv cuttings nro 

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

 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 family 



ORDER XXXII. OXALIDACK&. WOOD SORRELS. 



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

 ers regular, symmetrical, hypogynous, 5-merou3. Sepals persistent, imbricated; 

 petals convolute in cestivation. 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 7, species 328, inhabiting fhe hot and the temperate regions. The most noticeable 

 property of the Order is the sour juice, containing oxalic acid. Several species are cultivated 

 for the beauty of their flowers. 



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

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

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

 Mostly 5, with trifoliate Ivs. and inversely heart-shaped leaflets. 



1 O. Acetosella L. Acaukscent ; scope longer than the leaves, l-flowered; Ifts. 

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

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

 3-foliate, on long, weak stalks, purplish beneath. Fed. longer than the leave?, 

 each with a nodding, scentless flower whose petals are white, yellowish at the br.se, 

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



2 O. violacea L. Acaukscent, smooth ; scape umbeliferous ; pedicels, subpubes- 

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

 mens. An elegant species in rocky woods, etc., throughout the U. S. Bulb 

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

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

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

 violet-colored, striate. May. 



3 O. strfcta L. Caulescent; st. branching; pod. umbeliferous, longer than tho 

 petioles ; sty. as long as tho inner stamens. -(1) Fields, U. S. and Can., comcon. 

 It varies in size from 3 to 12', according to tho 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. Flp. 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 



8. CORNICULATA (0. corniculata L). Obs. Tho species (nearly 300 in number) 

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

 in cultivation. 



ORDER XXXIII. ZYGOPIIYLLACEJ3. 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 sestiva- 

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

 scale. Ovary compound ; fruit and seeds as in Linaceae. 



