43 2 



OXALIDACEAE. 



VOL. II. 



Pedicels appressed-pubescent ; cymes typically umbel-like. 

 Longer filaments glabrous. 



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



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. Brittoniac. 

 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. 



Oxalis 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 9"-!$' 

 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"-s" 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. repent Thunb. Oxal. 16. 178-1. 



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; nedicels strigillose, more or less 

 reflexed ; capsule oblong, gradually narrowed to the 

 apex, 5 "-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. 



