Tragia Euphorbiaceae 641 



or moist, sandy soil. Our specimens are from pastures and from along 

 railroads. This species and the preceding one are united in our manuals 

 but they are very distinct. The habitats within the known distribution 

 are quite different. The distribution of this species in Indiana offers an 

 interesting problem. 



N. H. to Fla. and Tex., northw. in the Mississippi Valley to Ind. and Wis. 



4416. TRAGIA [Plumier] L. 



1. Tragia cordata Michx. {Tragia macrocarpa Willd.) Map 1327. On 

 rocky, wooded bluffs of streams and black and white oak slopes. Rare. 

 Ind. to Mo., southw. to Fla. and Tex. 



4424. RfCINUS [Tourn.] L. 



See excluded species no 420, p. 1070. 



4498. EUPHORBIA L. Spurge 



Floral leaves with wide white margins; blades mostly 1.5-3 cm wide. .1. E. marginata. 

 Floral leaves without wide white margins, narrower than the preceding. 

 Glands of the involucre with a petallike appendage. 

 Leaves opposite, their bases more or less oblique. 



Leaves entire, rarely slightly serrate toward the obtuse apex. 

 Plants glabrous throughout. 



Leaves orbicular to orbicular-ovate 3. E. serpens. 



Leaves oblong to spatulate or somewhat obovate-oblong ; seeds reddish. 

 Seed strongly cross-wrinkled; leaves somewhat subcordate at the base. 



4. E. glyptosperma. 



Seed not cross-wrinkled or only faintly so; leaves often obovate-oblong, 



narrowed at the base. (See excluded species no. 422, p. 1071.) 



E. serpyllifolia. 



Plants more or less pubescent, at least the capsule more or less pubescent. . . . 



5. E. humistrata. 



Leaves serrate or dentate, at least toward the obtuse apex. 

 Capsules glabrous. 



Capsules 1.5 mm long or less ; seeds reddish. 



Seed strongly cross-wrinkled ; leaves somewhat subcordate at the base .... 



4. E. glyptosperma. 



Seed not cross wrinkled or only faintly so ; leaves narrowed at the base. 



(See excluded species no. 422, p. 1071.) E. serpyllifolia. 



Capsules more than 1.5 mm long; plants ascending; seeds drab. 



Capsules mostly 2-2.25 mm long, as wide as long, not deeply 3-lobed, 



rounded at the summit; stems puberulent only in lines 



6. E. maculata. 



Capsules about 1.75 mm long; wider than long, retuse at the apex, deeply 



3-lobed; pubescence of stems hirsute 7. E. vermiculata. 



Capsules more or less pubescent. 



Leaves mostly oblong to ovate-oblong, mostly 3x7 mm to 5x13 mm, 

 usually some or all serrate to below the middle, generally pubescent 

 beneath; capsules usually exserted well beyond the involucre, the lobes 

 generally rounded (sometimes acute); seed mostly 0.8-0.9 mm long, 

 generally plainly marked after the seed is cleaned with 3 or 4 transverse 

 rugose lines 8. E. supina. 



