72 EUPHORBIACE^E. Stilliugia. 



* * Anminis: spikes axillanj : leaves lanceolate, toothed, Z-nerved. 



3. S. (?) annua, Miill. Arg. Low (2 to G inches higli), somewhat viscid, dicliot- 

 oraously hranchcd, tho steins angled and leafy : leaves ovate to lanceolate, acu- 

 minate, narrowed to a broad winged petiole, stoutly 3-nerved from the base of tho 

 petiole, ciliate- or spinulose-dentate, an inch long : spikes shorter than the leaves, 

 with 1 to 3 naked pistillate tiowers at base: staminate bracts minute, 1-llowered; 

 the pistillate with small glanils on long stout pedicels : capsule 2 lines in diameter, 

 with prominent gynophore ; central column wanting: seed oblong-ovate, li lines 

 long, smooth, with no caruncle or a very small one. — IJC. Trodr. xvl 1160. 

 S. spinulosa, Torrey, Emory's Kep. 152. Sajnum (1) annmnn, Torrey, Lot. ;Mex. 

 Bound. 201. 



In the desert region of S. E. California and eastward ; on the Mohave {Emory, Parry, Cooper) ; 

 Fort Yiuna (SchoU) ; S. Utah, Bishop. A very iteculiar species. 



S. ToiiREYANA {S(ii>ium cmnuum, var. dcntalum, Torrey, Bot. ilex. Bound. 201 ; referred 

 doubtfully to Scbastidnia TrccuUaaa by Mueller, 1. c.) is anoiliersoniewiiat similar annual species, 

 with sessile leaves, sharply and sometimes doubly toothed, rounded aliove, cuneate at base, faintly 

 nerved, with short fimbriate stipules: spikes terminal, short and slender : bracts very small, 

 ovate, acute, 1 -flowered, with shortly stijtitate convex glands: pistillate calyx of 3 triangular 

 sepals : capsule 2 lines in diameter, with stout gynophore : seeds H lines long, with conspicuous 

 caruncle. Valley of the Rio Orancie; distinct from Sebaslinaid Trcculiann, which is of the same 

 region and of similar habit, but with oblanceolate leaves and smaller subgloboso seeds. 



7. EUPHORBIA, Linn. 



Flowers monoecious, included in cup-shaped 4 - 5-lobed involucres, the lobes 

 usually alternating with as many fleshy glands which are rounded or often petaloid- 

 margined or crescent-shaped. Staminate flowers numerous, of a single naked 

 stamen, jointed upon a short pedicel which has usually a minute bract at base : 

 anther-cells globose, distinct. Pistillate flower solitary in the centre of the invo- 

 lucre, pedicellate and soon exserted ; calyx none or minute. Ovary 3-celled and 

 3-ovided : styles 3, usually 2-cleft. Seeds often roughened, rugose or pitted, with 

 or without caruncle, (cotyledons linear to or^-ate. — ^Mostly herbaceous (as to our 

 species) perennials or anmials ; leaves opposite or alternate or the upper ones verti- 

 cillate, entire or toothed, often stipulate ; involucres terminal or in the forks, solitary 

 or umbellate-clustered, sometimes pseudo-axillary. — Engelm. in Bot. Mex. Bound. 

 185 ; Boissier in DC. Prodr. xv^. 7. 



A vast genus (of about 700 species) of all temperate and warmer regions, of very various habit 

 and characteristics. Nearly 100 species are found within the limits of the United States, chiefly 

 in the southern portion, low annuals or often taller herbaceous perennials, very rarely somewhat 

 woody, with a single exception not shrubby or arborescent as fretjuently in the tropics. 



I. Glands of the involucre mostbj ivith a colored membranaceous margin, entire or 

 toothed (tvithoiit margin and concave in n. 1). 



§ 1. Leaves all opposite,- oblique and unequal at base ; stipules persistent, scale-like 

 and entire or lacerate: involucres small. Our species mostly prostrute, 

 slender and repcatedhj branched from the base, with small leaves on verij 

 short petioles, the involucres solitary, rarely cymose, icith 4 glands (2 to 4 

 in n. 1); seeds ash-colored. — Anisophyllum, Koeper. 



* Seeds smooth {occasionally wrinkled in n. 3) : leaves entire. 



1. E. ocellata, Pur. & Hilg. Annual, prostrate or ascending, glabrous and 

 glaucous, the stems often 6 inches long : leaves thick, deltoid to ovate-oblong, acute, 

 often cordate at base, 2 to 5 lines long ; stipules setaceous, entire or sparingly cleft : 



