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4. Euphorbia Geyeri Engelm. & Gray. 
Geyer’s Spurge. (Fig. 2310.) 
Euphorbia Geyeri Engelm. & Gray, Bost. Journ. Nat. 
Hist. §: 260. 1847. 
Aunual, olive-green, glabrous. Stem branched 
from the base, the prostrate branches radiately 
spreading, wiry, 2’-15’ long; leaves oblong or ovate, 
2//-6/’ long, obtuse, usually mucronulate, entire or 
nearly so, oblique, obtuse or subcordate at the base, 
short-petioled; stipules a fringe of short setae; in- 
volucres usually solitary in the axils, campanulate, 
about %/’’ high, with 4 wineglass-shaped glands 
shorter than the lobes, each subtended by an in- 
conspicuous white or red entire or lobed appendage; 
peduncles as long as the involucres, or longer; cap- 
sule globose-reniform, about 1’’ long, nodding; seeds 
narrowly ovoid, 34’ long, ash-colored, nearly terete. 
In sandy soil, Minnesota to Illinois and Kansas. 
July—Sept. 
5. Euphorbia sérpens H.B.K. Round-leaved Spreading Spurge. 
(Fig. 2311.) 
Euphorbia serpens H.B.K. Nov, Gen, 2: 52. 
Annual, pale green, glabrous, sometimes glau- 
cescent. Stem branched from the base, the 
1817. 
slender or filiform branches prostrate, 2’-12’ long; 
leaves orbicular, orbicular-ovate or oval, 1//-3// 
long, obtuse or emarginate, entire, often slightly 
revolute-margined, short-petioled, the base ob- 
lique, rounded or subcordate; stipules triangular, 
somewhat incised at the apex; peduncles slightly 
longer than the petioles; involucres solitary in 
the axils, nearly 4’ high, bearing 4 sessile saucer- 
shaped glands shorter than the lobes, each sub- 
tended by a minute irregular crenulate append- 
age; capsule nodding, depressed-globose, 1/’ in 
diameter; seeds oblong-ovoid, %’’ long, smooth, 
obtusely 4-angled, light gray. 
Illinois to Iowa and Kansas, south to Mexico. 
March-Oct. 
6. Euphorbia serpyllifolia Pers, 
Thyme-leaved Spurge. (Fig. 2312.) 
Euphorbia serpyllifolia Pers, Syn. 2:14. 1807. 
Annual, dark green, or becoming reddish, gla- 
brous. Stem branched from the base, the slender 
branches prostrate or ascending, 4’-12’ long; 
leaves oblong to spatulate, 1'4’/-6’’ long, obtuse 
or retuse, nearly entire, or serrulate to below the 
middle, short-petioled, the base oblique, mostly 
truncate or obtuse; stipules at length a fringe of 
weak setae; involucres solitary in the axils, some- 
times clustered toward the ends of the branchlets, 
less than 1’ long, bearing 4 disk-like glands each 
subtended by a narrow lobed appendage; capsule 
1’’ broad, slightly nodding; seeds ovoid, hardly 
4” long, 4-angled, the faces transversely wrink- 
led and pitted. 
In dry soil, Wisconsin to California, south to 
Mexico. May-Sept. 
