268 
leaflets broader than long, acutely notched at the apex, usually 
thinnish, the cellular structure not prominent under a lens; 1n- 
florescence axillary, cymose; peduncles wiry or filiform, 5-10 cm. 
long; pedicels 5-8 mm. long, villous, erect or ascending, subtended 
by linear-lanceolate bracts; flowers yellow; sepals lanceolate or 
narrowly elliptic, 4-5 mm. long, obtuse or acutish, erect or at. 
length spreading ; petals obovate or somewhat spatulate, 7-9 mm, 
long, many-nerved, obtuse or emarginate at the apex; capsule 
columnar, I-1.5 cm. long, gradually narrowed to the apex; seeds 
obovoid-oblong, 1.2 mm. long, marked with prominent con- 
tinuous ridges. 
Ontario to the Lake Superior region and Nebraska, south to 
the Gulf of Mexico. Flowers somewhat earlier than O. stricta. 
There is another relative of Oxalis corniculata occurring in our 
campestrian territory that appears to need study. I have examined 
the plant in the field and in the herbarium during several years and 
am convinced that it is specifically distinct from all other forms. 
Rafinesque apparently found this form many years ago and de- 
scribed it in his New Flora,* and Prof. Trelease has described? it as 
a probable variety of Oxalis corniculata. The following is a de- 
scription of the species as I now know it. 
OXALIS MACRANTHA (Trel.). 
? Oxalis caespitosa Raf. New. Fl. 2: 27. 1836. Not A, St. 
Hill. 
Oxalis corniculata var.? macrantha Trel. Mem. Bost. Soc. Nat. 
Hist. 4: 88. 1888. 
Usually perennial by horizontal rootstocks, stoutish or hirsute. 
Stems erect or assurgent, sometimes loosely tufted, 1-3 dm. tall, 
often becoming woody at the base, commonly leafy throughout, 
sometimes densely hirsute ; leaves I cm. or usually 2~3 cm. broad, 
more or less silky-pilose; petioles filiform, 3-9 cm. long, pubes- 
cent like the stem ; leaflets ciliate, sharply notched at the apex; 
peduncles filiform, exceeding the petioles; flowers bright yellow 
or golden, 2~-2.5 cm. broad, 2-5 umbel-like at the ends of the pe- 
_duncles; pedicels 1-2 cm. long, about as long as the flowers, sub- 
_ tended by linear-subulate bracts; sepals ovate or oblong, 6 mm. 
long, obtuse, minutely pubescent, 6-12 nerved, nearly erect, the 
tips sometimes spreading, petals nearly 1.5 cm. long, slightly 
notched at the apex; ovary glabrous or nearly so; styles villous; — 
* New FI. 2:27. 1836, = 
_ 4Mem. Bost. Soc. Nat. Hist. 4: 88, 1888. 
