59 FLORA. 



the bractlets, the calyx slightly 2-3-lobed ; stamens 2 or 3, exserted. Pistillate flowers 

 solitary in the axils of the lower bractlets; calyx 3-lobed. Capsule 2-lobed or 3- 

 lobed, separating into 2 or 3 two-valved carpels. [In honor of Dr. B. Stellingfleet, 

 an English botanist.] About 15 species, mostly of tropical America and the islands 

 of the Pacific Ocean. 



i. Stillingia sylvatica L. QUEEN'S DELIGHT. QUEEN-ROOT. (I. F. f. 

 2306.) A bright green slightly fleshy herb. Stem usually branched from the 

 base, 3-11 dm. tall. Leaves obovate, oblong or elliptic, i-io cm. long, serrate 

 with appressed teeth, often narrowed at the 2-glandular base, sessile; flowers 

 lemon-colored, subtended by small bracts furnished with saucer-shaped glands; 

 calyx cup-shaped; glandular disk none; capsule depressed, 1-1.5 cm - * n diameter, 

 3-lobed; seeds ovoid, 6 mm. long, light gray, minutely pitted and papillose, the 

 base flattened. In dry soil, Va. to Fla., Kans. and Tex. March-Oct. 



ii. EUPHORBIA L. 



Monoecious herbs (many tropical species shrubs), with alternate, opposite or 

 verticillate leaves. Flowers borne in involucres. Sinuses of the involucres usually 

 bearing glands, naked or appendaged. Staminate flowers scattered over the inner 

 surface of the involucre, consisting of a stamen jointed on a filament-like pedicel, 

 which is subtended by a minute bractlet supposed to represent a calyx. Pistillate 

 flower solitary, at the bottom of the involucre, at length usually exserted on a 

 stalk. Capsule 3-lobed, separating into 3 2-valved carpels. Seeds sometimes 

 caruncled, variously pitted, ridged or wrinkled. [Named in honor of Euphorbus, 

 King Juba's physician.] Species about 700, most abundant in the warmer parts of 

 the temperate zones. Besides the following, some 95 others occur in the southern 

 and western parts of N. Am. 



* Glands of the involucre with petal-like appendages. 

 f Leaves opposite, inequilateral, their bases more or less oblique. 

 \ Leaves entire; seeds smooth. 



Plants branched at the base, the branches prostrate. 



Seeds about 3 mm. long. i. E. polygonifolia. 



Seeds 1-2 mm. long. 



Leaves usually more than twice as long as broad; seeds nearly terete, 



1.5 mm. long. 4. E. Geyeri. 



Leaves usually less than twice as long as broad; seeds obtusely 4- angled, 



i mm. long. 5. E. serpens. 



Plants with an erect or ascending stem, branched above, the branches ascending. 

 Seeds nearly terete, 2 mm. long; leaves usually flat and straight. 



2. E. petaloidea. 

 Seeds 4-angled, 1.5 mm. long; leaves often involute and curved. 



3. E. Nuttallii. 

 \ \ Leaves entire ; seeds variously roughened. 



Plants glabrous. 13. E. Fendleri. 



Plants canescent. 14. E. lata. 



\ \ \ Leaves serrate or dentate; plants prostrate or spreading. 

 Herbage glabrous. 



Seeds faintly transversely ridged and pitted. 



Leaves of main branches mostly less than i cm. long; seeds gray. 



6. E. serpyllifolia. 



Leaves of main branches over i cm. long ; seeds brown. 7. E. albicaulis. 

 Seeds strongly transversely ridged, not pitted. 8. E.glyptosperma. 



Herbage pubescent or puberulent. 

 Seeds gray or white. 



Leaves toothed at the apex; involucres campanulate; seeds pitted. 



12. E. stictospora. 

 Leaves toothed nearly to the base; involucres turbinate; seeds transversely 



wrinkled. 9. E. kirsuta. 



Seeds brown or black. 



Involucres not split. 10. E. maculata. 



Involucres split on one side. n. E. humistrata. 



\ % \ \ Leaves serrate or dentate; plant erect or ascending. 15. E. nutans. 



\ f Leaves opposite, equilateral, their bases not oblique. 



16. E. hexagontit 

 \ f f Leaves alternate or scattered on the stem, except a whorl subtending the umbel. 



