The Flora of the Cayuga Lake Basin 283 



68. OXALIDACEAE (Wood Sorrel Family) 



1. Oxalis L. 



a. Flowers pale pink or white, purple-veined; plant scapose. 1. O. montana 

 a. Flowers yellow ; plant caulescent. 



b. Flowers in well-developed plants 2-4 together, subumbellate ; pedicels in fruit 



reflexed, but capsules erect ; capsule cylindrical, varying in length ; hairs of the 



capsule, if any, fine and dense; true rhizomes wanting, except in no. 4. 



c. Plant creeping, rooting at the nodes; stipules broad, rounded, brownish; 



fruiting pedicels short, mostly 4-12 mm. long; capsule 8-15 (18) mm. long, 



abruptly acute, evenly and rather closely puberulent, often viscid; pubescence 



of stem and petioles spreading. 2. O. comiculata, 



var. viscidula 

 c. Plant normally erect, but sometimes with a decumbent and rooting base ; 

 stipules usually oblong or obsolete, greenish ; fruiting pedicels averaging 

 longer, 10-25 mm. long. 

 d. Body of capsule (10) 15-25 mm. long, densely puberulent and often with 

 some longer viscid hairs intermixed, abruptly acute, short-beaked ; styles 

 about 2 mm. long; petioles and pedicels rather stout; stipules oblong, 

 firm; pubescence of stem, petioles, and pedicels, appressed; plant pale, 

 often slightly succulent. 

 e. Pubescence of the capsule with some loose subvillous viscid hairs. 



3. O. stricta 

 e. Pubescence of the capsule appressed, nonviscid. 3a. O. stricta, 



var. piletocarpa 



d. Body of capsule 9-15 mm. long, sparingly puberulent below, more densely so 



at apex, generally more gradually pointed ; styles 2-A mm. long ; petioles 



and pedicels more slender ; stipules obsolete ; pubescence of stem rather 



loose, curly and tawny; plant greener, not succulent. 4. O. florida 



b. Flowers in well-developed plants 2-many, cymose; pedicels in fruit spreading, 



not reflexed; capsule oblong-conic, 5-12 mm. long, with scattered, spreading, 



more or less viscid hairs, or nearly glabrous, tapering to the long, strigose 



styles ; stipules obsolete ; cauline hairs spreading or subappressed, sometimes 



wanting; plant producing long slender horizontal rhizomes. 



5. O. europaea 



1. O. montana Raf. (See Rhodora 22:143. 1920. 0. americana Bigel. O. ace- 



tosella of Cayuga Fl.) Pink Wood Sorrel. 



Damp humus in deep woods, especially of hemlock; frequent. June-July 15. 



Headwaters Swamp; Enfield Glen (DA) ; Ellis Hollow Swamp (DA); Fall 

 Creek; Dryden Lake; Fir Tree Swamp, Freeville, and Freeville Bog; Woodwardia 

 Bog ; McLean Bogs ; Beaver Brook ; Chicago Bog ; Lake Como ; and elsewhere. 



N. S. and e. Que. to Sask., southw. to n. and w. N. E., N. Y., and in the mts. to 

 N. C. 



2. O. corniculata L., var. viscidula Wiegand. (0. re pens of Gray's Man., ed. 7.) 



Creeping Yellow Wood Sorrel. 



In greenhouses and on gravel walks adjoining; occasional. June- Aug. 



Walks near the Sage College greenhouses, formerly; in the Agricultural College 

 greenhouses. 



Scattered through the Northern States, mostly near greenhouses or on ballast; 

 almost cosmopolitan, but in the Northern and Eastern States introduced. 



For a revision of the yellow-flowered species of Oxalis, see Rhodora 27: 113. 1925. 



