Part 1, 1907] OXALIDACEAE 51 



1. Xanthoxalis stricta (L.) Small, Fl. SE. U. S. 667. 1903. 



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



orniculala stricta Sav. in Lam. Encvcl. 4: 683. 1797. 

 ? Oxalis Lyoni Pursh, Fl. Am. Sept. 322. 1814. 

 lOxalis furcata Ell. Bot. S. C. & Ga. 1 : 527. 1818. 



Oxa ulala Dillenii Trel. in A. Gray, Syn. Fl. N. Am. 1> : 365. 1897. Not Oxalis Dil- 



lenii Jacq. 1794. 



Stems erect, but elongate and ultimately decumbent, 0.5-5 dm. long, arising from 

 short or occasionally somewhat elongate rootstocks, strigillose, typically densely so, and 

 stout ; leaflets pale- or bright-green, the blades mostly 15-20 mm. wide, or smaller on depau- 

 perate plants, glabrous or with few scattered hairs and sometimes ciliate ; peduncles longer 

 than the petioles but usually overtopped by the stem or its branches ; pedicels strigillose, 

 not conspicuously elongate ; sepals 4-5 mm. long at maturity ; petals pale- or light-yellow, 

 5-10 mm. long; filaments glabrous, slender; capsules columnar, stout, 16-30 mm. long, 

 rather abruptly pointed at the apex, minutely but closely pubescent. 



Tvpk locality : Virginia. 



Distribution : Nova Scotia to Wyoming, Florida, New Mexico, and Mexico. 



Illustrations : Jacq. Oxalis Monogr. //. 4 ; Britt. & Brown, 111. Fl./. 2254. 



2. Xanthoxalis texana Small, Fl. SE. U. S. 667. 1903. 



Stems erect or slightly decumbent, but not elongate as in A", stricta, and densely 

 strigillose, but with the hairs less appressed than in the case of that species, the horizontal 

 rootstocks elongate; leaflets bright-green, the blades mostly 10-13 mm. wide, strigillose; 

 peduncles conspicuously elongate and much overtopping the stem or its branches ; ped- 

 icels strigillose, conspicuously elongate; sepals 5.5-6.5 mm. long at maturity; petals 

 golden-yellow, 12-18 mm. long; filaments glabrous, more or less dilated, the inner ones 

 often conspicuously so ; capsules columnar, 12-15 mm. long. 



Typk locality : Alvin, Texas. 

 Distribution : Texas. 



3. Xanthoxalis Bushii Small, Fl. SE. U. S. 667. 1903. 



Oa alis Bushii Small, Bull. Torrev Club 25 : 611. 1S98. 



<>\ alis coloradensis Rydb. Bull. Torrev Club 29 : 243. 1902. 



Xanthoxalis coloradensis Rydb. Fl. Colo. 220. 1906. 



Stems erect or nearly so, 1-3 dm. tall, from slender rootstocks, villous or villous- 

 hirsute, or nearly glabrous except on the younger parts; leaflets bright-green, the blades 

 7-20 mm. broad, more or less strigillose and ciliate, especially when young, or glabrous 

 in age ; peduncles overtopping the stem or the branches at least at maturity ; cymes umbel- 

 like, usually maturing 1 flower at a time which is accompanied by several drooping buds ; 

 pedicels strigillose, not greatly elongate; sepals 3^1.5 mm. long; petals pale-yellow or 

 lemon-yellow, 9-12 mm. long; filaments glabrous; capsules long-columnar, 12-15 mm. 

 long, or rarely smaller, glabrous, gradually pointed at the apex. 



Type locality : Jackson County, Missouri. 



Distribution : Nova Scotia to South Dakota, Colorado, and Georgia. 



4. Xanthoxalis rufa Small, Fl. SE. U. S. 668. 1903. 



Oxalis /nr'a Small, in Britton, Man. 577. 1901. 



Stems erect and 1.5—1 dm. tall, or sometimes diffusely branched and with some of the 

 branches decumbent, loosely pubescent, usually sparingly so, or almost glabrous, the root- 

 stocks slender and often elongate ; leaflets reddish or purplish, but often fading to green, 

 the blades S-20 mm. wide, sparingly strigillose or glabrous especially in age, except the 

 ciliate margins ; peduncles much longer than the petioles ; pedicels conspicuously short, 

 the several flowers, or capsules, clustered ; sepals 3-4 mm. long; petals rather bright-yell' iw, 

 7-10 mm. long; filaments glabrous; capsules short-columnar, 7-9 mm. long, glabrous, 

 abruptly pointed at the apex. 



Type locality : Xew York Botanical Garden, cultivated ; from Monroe County, Pennsyl- 

 vania. 



Distribution : Massachusetts to Minnesota and Georgia. 



