714 EUPHORBIACEAE 
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 stictospdra (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. 
yl a pitted, gray or ash-colored, sharply 4-angled. [Euphorbia stictospora 
ngelm. 
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 Guadalupénsis Small. [Euphorbia stictospora var. Tex- 
ensis Millsp., not Euphorbia Texana Boiss.] 
40. Chamaesyce adenóptera (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 : 
involueres 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. J 
In pine lands, Florida and tropical America. Spring to winter. 
41. Chamaesyce pilulífera ( 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 em. 
long, is C. pilulifera procümbens (Boiss.) Small. ` LE. pilulifera var. procumbens Boiss.] 
24. ZYGOPHYLLÍDIUM 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 Jess papillose, the 
caruncle sometimes wanting. SPURGE. 
1. Zygophyilldium hexágonum (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 : 
ovoid or oblong-ovoid, 3 mm. long, terete, papillose. Euphoria. hexagona Nutt. ] 
On prairies, lowa to Montana, Texas and Colorado. Spring to fall. 
25. TRICHEROSTIGMA KI. & 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. 
