EUPHORBIACEAE 717 
3 mm. high, glabrous, seated on the involucre: seeds subglobose, about 2 mm. long, . 
smooth. [Euphorbia Curtisii Engelm.] 
In pine lands, North Carolina to Florida. Summer. 
7. Tithymalopsis exsérta Small. Perennial, glabrous, branched at the base, the 
branches closely or loosely tufted, 1-3 dm. long, forking above, reddish or purple: leaves 
alternate below the umbel, thence opposite ; blades oblong or lanceolate, 2-6 cm. long, 
obtuse or acutish, somewhat undulate, sessile or nearly so : peduncles filiform, 1-3.5 cm. long 
at maturity : involucres campanulate, nearly 2 mm. high, white or whitish green, erect : 
glands transversely oblong, less than 1 mm. broad ; appendages narrow undulate borders 
or a mere line: capsules 4 mm. in diameter, well exserted beyond the involucres: seeds 
3-3.5 mm. long. 
In pine lands, Florida. Summer. 
8. Tithymalopsis Joórii (Norton) Small. Perennial, glabrous or pubescent. Stems 
1-1.5 dm. tall, sparingly branched at the base and above: leaves alternate, few ; blades 
ovate to broadly oblong, 1-2 cm. long, obtuse, sometimes undulate, sessile : peduncles 10- 
25 mm. high: involucres few, 2-2.5 mm. high : glands narrow ; appendages suborbicular 
to cuneate, one or two of them often imperfect: capsules globular, somewhat depressed, 
3-4 mm. broad: seeds globose-ovoid. [Euphorbia corollata var. Joorti Norton.] 
In dry soil, eastern Texas. Spring and summer. 
9. Tithymalopsis zinniifldra Small. Perennial, dark green. Stems usually solitary, 
erect, 3-5 dm. tall, with a few ascending branches below the 3-rayed umbel, pubescent 
with scattered hairs : leaves alternate except those subtending the umbel ; blades narrowly 
linear-lanceolate, or nearly linear, 2-5 cm. long, mostly reflexed, acute or rather obtuse, 
sparingly pubescent above, glabrate beneath, somewhat revolute, nearly sessile or with 
somewhat hairy petioles less than 1 mm. long: peduncles slender, erect, 1-3.5 cm. long, 
angled, especially above: involucres campanulate, 2 mm. high, angled: glands oblong- 
reniform, fully 1 mm. broad ; appendages white or pink, suborbicular or 4-sided, 3 mm. 
long, rounded or emarginate at the apex: capsules 4.5-5 mm. in diameter. [Euphorbia 
zinniiflora Small. ] 
In sandy soil, Georgia and Alabama. Spring. 
10. Tithymalopsis apocynifdlia Small. Perennial, bright green. Stems solitary or 
tufted, erect or ascending, 2-6 dm. tall, slender, pubescent or glabrate, zigzag, at least at 
maturity, the umbel 2-3-rayed, the rays dichotomous, wire-like or filiform, ascending: 
leaves alternate except the whorl or pair subtending the umbel ; blades thinnish, oblong to 
oval, 2-7 em. long, obtuse, slightly revolute, pale beneath, with glaucous midrib sometimes 
pubescent on both sides ; petioles 3-6 mm. long, densely villous: bracts opposite, similar 
to the leaves but smaller : peduncles filiform, glabrous : involucres campanulate, barely 1.5 
mm. high, glabrous : glande transversely oblong, about 0.5 mm. broad ; appendages white, 
orbicular-cuneate, 1.5-2 mm. long, rounded at the apex: capsules about 5 mm. in diam- 
eter [ Euphorbia apocynifolia Small. ] 
In sandy soil, Georgia and Florida to Mississippi. Summer and fall. 
ll. Tithymalopsis discoidàlis (Chapm.) Small. Perennial, sparingly pubescent or 
glabrous. Stems erect or ascending, the umbel usually 3-rayed, the rays mostly forked, 
slender : leaves scattered except those subtending the umbel ; blades linear, 2-6 cm. long, 
obtuse, revolute, paler beneath, sessile: involucres campanulate, at least 1 mm. high, as 
long as the peduncle or shorter: glands deep red, transversely oblong, 1 mm. broad ;' ap- 
pendages reniform, white: capsules subglobose, 3 mm. high, the angles rounded : seeds 
ovoid, pale red. [Euphorbia discoidalis Chapm. ] 
In dry sand, Florida. Summer and fall. 
. 12. Tithymalopsis olivàcea Small. Perennial, olive green, glabrous. Stems sol- 
itary or several together, 2-7 dm. tall, simple or branched at the base, the branches erect 
or ascending, forking above or topped by a 3-rayed umbel : leaves alternate below the 
umbel ; blades leathery, oblong, obovate-oblong or cuneate, 1-3 cm. long, obtuse, or notched 
at the apex and with a short mucro, sessile or short-petioled : involucres scattered along 
the slender branchlets, campanulate, about 1.5 mm. high, angled: glands transversely ob- 
long, about 0.5 mm. broad ; appendages white, 1-5 mm. long, orbicular cuneate, minutely 
erose at the top : capsules 3.5-4 mm. in diameter. [Euphorbia olivacea Small.] 
In sandy soil, northern Mississippi. Summer. 
13. Tithymalopsis corollàta (L.) Small. Perennial by a long stout rootstock, bright 
green, glabrous or somewhat pubescent. Stems erect, 2-9 dm. tall, often spotted, aalis 
simple, the umbel patna e : leaves opposite ; blades linear, oblong, or oblong- patulsie, 
2-4 cm. long, entire, short-petioled or sessile, the lower scattered, those subtending the 
