416 



OXALIDACEAE 



OXALIDACEAE 



Acaulescent; rootstocks bulb-like or scaly; flowers white, pink or 

 purple. 



Sepals without tubercles; rootstocks elongated. I. Oxalis. 



Sepals with apical tubercles; rootstocks bulb-like. 2. Ionoxalis. 



Caulescent; flowers yellow. 3. Xanthoxaus. 



i. Oxalis L. 

 1. O. Acetosella L. In woods: N. S. to Man. and southward on 

 or near the mountains to N. Car. and Tenn. Also in Europe 

 and Asia. 

 Conn. Recorded only from northern Hartford and Litchfield 



counties. 

 N. Y. The mountains of Ulster, Delaware and Greene counties. 

 Pa. Wayne, Luzerne, Carbon, Lackawanna and Monroe counties. 

 Tertiary, o: Cretaceous, o: Older Formations, rare except north- 

 ward. South of the moraine only in Pa. 1 17-158 days. 800- 

 4,000 ft. 



2. Ionoxalis Small 



1. I. violacea (L.) Small (0. violacea L.). In woods: Me. 

 to the Rocky Mountain Region, Fla. and Tex. 



Throughout the range, except in the pine-barrens, there wanting. 



3. Xanthoxalis Small 



Pedicels appressed-pubescent: cymes typically umbel-like. 

 Longer filaments glabrous; stems not woolly. 



Stem appressed-pubescent, not creeping; capsules pubes- 

 cent, i. X. slricta. 

 Stem loosely pubescent: capsules glabrous at maturity, 

 except in X. corniculata, an introduced creeping 

 plant. 

 Plants spreading and creeping: capsules pubescent. 2. A", corniculata. 

 Plants erect: capsules glabrous. 



Cymes open at maturity, usually 1-3-flowered; 



capsules slender, gradually pointed. 3. A'. Bitshii. 



Cymes cluster-like at maturity, usually 4-6- 



flowered; capsules stout, abruptly pointed. 4. A', rufa. 



Longer filaments pubescent; stems mostly woolly. 



Leaves numerous; cymes mostly 1-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, 



Pedicels loosely pubescent, usually villous; cymes dichotomous. 7. 



A'. Brittoniae. 

 X. cytnosa. 



i. X. stricta (L.) Small (Oxalis strictah.). In fields and along 

 roadsides: N. S. to Wyo., Fla., N. Mex. and Mex. 

 Not uncommon as a weed in most parts of our area. 



