43 2 



OXALIDACEAE. 



VOL. II. 



Pedicels appressed-pubescent ; cymes typically umbel-like. 

 Longer filaments glabrous. 



Stem appressed-pubescent, not creeping; capsules pubescent. i. X. stricta. 



Stem loosely pubescent ; capsules glabrous except in No. 2, a plant with creeping stems. 



Plants spreading and creeping ; capsules pubescent. 2. X. corniculata. 



Plants erect ; capsules glabrous. 



Cymes open at maturity ; capsules gradually pointed. 3. X. Bushii. 



Cymes cluster-like at maturity ; capsules abruptly pointed. 4. X. rufa. 



Longer filaments pubescent. 



Petals glabrous ; pistil, or styles, short-hairy. 



Stem and branches finely soft-pubescent or nearly glabrous ; primary branches of the 



cyme short or obsolete. 

 Leaves numerous; cymes mostly i -flowered; capsules less than thrice as long as the 



calyx. 5- X.filipes. 



Leaves few ; cymes mostly several-flowered ; capsules over thrice as long as the calyx. 



6. X. Brittoniae. 

 Stem and branches hirsute ; primary branches of the cyme long ; leaflets copiously 



strigillose. 7- X. interior. 



Petals pubescent ; pistil, or styles, long-hairy. 8. X. Priceae. 



Pedicels loosely pubescent. 



Capsule-body several times longer than the sepals ; leaflets uniformly green. 9. X. cymosa. 

 Capsule-body scarcely twice as long as the sepals; leaflets brown-margined. 10. X. grand is. 



i. Xanthoxalis stricta (L.) Small. Upright 

 Yellow Wood-sorrel. Fig. 2665. 



Oxalis stricta L. Sp. PI. 435. 1753- 



O.ralis corniculata var. stricta Sav. in Lam. Encycl. 4 : 



683. 1797- 

 Xanthoxalis stricta Small, Fl. SE. U. S. 667. 1903. 



Plants usually low and erect, pale green. Stem 

 commonly branched at the base, the branches spread- 

 ing, 5 '-6' long, more or less strigose; leaves g"-ii' 

 broad ; leaflets coarsely cellular, very sensitive, clos- 

 ing when touched; petiole-bases narrowly dilated; 

 flowers yellow, fragrant, in umbel-like cymes, pe- 

 duncles ii'-6' long, stout; pedicels at length de- 

 flexed ; sepals linear or lanceolate, about 2\" long, 

 ciliolate, erect or ascending; petals 4"-5" long, com- 

 monly reddish at the base; capsule columnar, 8"-is" 

 long, abruptly narrowed at the summit. 



In woods and fields, Nova Scotia to Wyoming, Colo- 

 rado, south to Florida and Texas. Introduced into Eu- 

 rope as a weed. Sheep- or poison-sheep-sorrel. Toad- 

 sorrel. Ladies'-sorrel or -sour-grass. April-Oct. 



2. Xanthoxalis corniculata (L.) Small. Yel- 

 low Procumbent Wood-sorrel. Fig. 2666. 



Oxalis corniculata L. Sp. PI. 435. 1753. 



?O. repens Thunb. Oxal. 16. 1781. 



Xanthoxalis corniculata Small, Fl. SE. U. S. 667. 1903. 



Plants depressed, green, sparingly pubescent or 

 nearly glabrous, freely branching from the base and 

 with a few branches above. Stem i'-6' high, the 

 branches loosely pubescent, diffuse, mainly procum- 

 bent and often rooting from the nodes ; leaflets ob- 

 cordate, wider than long, about \' wide; petioles 

 slender, dilated at the base into oblong rounded or 

 truncate stipules ; peduncles i-3-flowered ; flowers 

 yellow, 2"-6" long; pedicels strigillose, more or less 

 reflexed ; capsule oblong, gradually narrowed to the 

 apex, s"-9" long, appressed pubescent. 



In ballast about the eastern sea-ports, and frequently 

 growing on the ground in greenhouses. Texas and 

 throughout tropical America. Has been found in On- 

 tario. Occurs also in warm and tropical regions of the 

 Old World. Ladies'-sorrel. Feb.-Nov. 



