714 EUPHOKBIACEAE 



at the oblique base, short-petioled : involucres turbinate-campanulate, villous, barely 

 2 mm. high, sessile or nearly so : glands bearing very irregular reddish or magenta 

 toothed appendages, 2 of them nearly as long as the body of the involucre : capsules ovoid- 

 globose, about 1 mm. long, minutely pubescent : seeds oblong-ovoid, 0. 6 mm. long, with 

 strong transverse wrinkles. 



In sand, southern peninsular Florida and tropical America. Spring to winter. 



39. Chamaesyce stictospora (Engelm. ) Small. Annual, yellowish green, pilose 

 throughout. Stem branched at the base, the branches ascending or radiating, 5-30 cm. 

 long : leaves numerous ; blades oblong to suborbicular, 4-6 mm. long, obtuse, dentate-ser- 

 rate at the apex, short-petioled, the bases truncate or subcordate ; stipules fringed : invo- 

 lucres clustered, campanulate, 1 mm. high : glands 4, cup-shaped ; appendages rather 

 inconspicuous, crenate, some of them irregular or obsolete : peduncles at length longer than 

 the involucres : capsules ovoid, 1-2 mm. in diameter: seeds narrowly ovoid, 1.2-1. 5 mm. 

 long, pointed, pitted, gray or ash-colored, sharply 4-angled. [Euphorbia stictospora 

 Engelm.] 



On prairies, Kansas and Colorado to Mexico. Spring to fall. A Texan variety, with less pubescent 

 foliage, broader and more strongly nerved leaf-blades smaller and broader seeds and narrower append- 

 ages to the glands of the involucre, is C. stictospora Guadalupensis Small. [Euphorbia stictospora var. Tex- 

 ensis Millsp., not Euphorbia Texana Boiss.l 



40 Chamaesyce adenoptera (Bertol. ) Small. Annual, closely villous. Stems 

 branched at the base, the branches decumbent or prostrate, 0.5-1.5 dm. long, simple or 

 forking : leaves numerous, approximate or nearly contiguous, blades oblong or ovate- 

 oblong, 4-8 mm. long, acute or acutish, serrulate, very oblique at the base, short-petioled : 

 involucres about 1 mm. high, campanulate or turbinate-campanulate, densely pubescent : 

 glands minute ; appendages white or rose, 2 often much longer than the others, oblique, 

 toothed: capsules 1.5 mm. long, densely pubescent, the angles sharp: seeds about 1 mm. 

 long, oblong, 4-angled, the faces transversely wrinkled. [Euphorbia adenoptera Bertol.] 



In pine lands, Florida and tropical America. Spring to winter. 



41. Chamaesyce pilulifera ( L. ) Small. Annual, pubescent. Stems usually branched 

 at the base, the branches ascending or prostrate, 1-4 dm. long, forking or simple : leaf- 

 blades oblong to oblong-lanceolate, 1-2.5 cm. long, acute, finely serrate, blotched in the 

 middle, oblique, manifestly petioled : involucres in dense short-stalked clusters, turbinate, 

 less than 1 mm. high: glands minute, 0.2 mm. broad; appendages obsolete: capsules 

 little over 1 mm. broad, pubescent : seeds 0.9 mm. long, the faces slightly wrinkled trans- 

 versely. [Euphorbia pilulifera L.] 



In sand, Florida to Texas, New Mexico and tropical America. Also in the tropics generally. 

 Spring: to winter. The small form with closely prostrate branches and leaves commonly about 1 cm. 

 long, is C. pilulifera procumbens (Boiss.) Small. [E. pilulifera var. procumbens Boiss.] 



24. ZYGOPHYLLIDIUM Small. 



Annual herbs, with erect forking stems. Leaves opposite or rarely alternate on the 

 lower part of the stem : blades narrow, equilateral, not oblique at the base, entire : stipules 

 gland-like, often obsolete. Involucres delicate, short-peduncled in the upper forks. 

 Glands 5, broader than long, subtended by petal -like appendages. Capsules long-pedi- 

 celled, 3-lobed. Seeds terete, usually narrowed upward, more or less papillose, the 

 caruncle sometimes wanting. SPURGE. 



1. Zygophyilldium hexagomim (Nutt. ) Small. Yellowish green, glabrous or spar- 

 ingly pubescent. Stems slender, 1-5 dm. tall, branched, the branches ascending, often almost 

 filiform : leaves mainly opposite ; blades linear, oblong or lanceolate, very short petioled, 

 obtuse or acute, equilateral ; stipules obsolete or very narrow : involucres solitary in the 

 axils, often clustered, 2-3 mm. long, ciliate, pubescent, short-peduncled, with 5 glands ; 

 appendages triangular-ovate whitish or green : capsules glabrous, 4 mm. in diameter : seeds 

 ovoid or oblong-ovoid, 3 mm. long, terete, papillose. [Euphorbia hexagona^ utt.~\ 



On prairies, Iowa to Montana, Texas and Colorado. Spring to fall. 



25. TRICHEROSTIGMA Kl. & Garcke. 



Shrubs, with erect or procumbent stems and more or less succulent tissues. Leaves 

 scattered, few, usually fugacious : blades small, becoming firm. Stipules none. Invo- 

 lucres solitary, and subtended by fleshy bracts near the ends of the branches, or in axillary 

 cymes, hemispheric, pubescent within ; lobes toothed or fimbriate. Glands 5, subtended 

 by entire petal-like appendages. Capsule 3-lobed, exserted. Seeds 4-sided, somewhat 

 wrinkled. 



