SPURGE FAMILY. 381 



oblong-linear, obtuse and nuicronate ; lobes of the involucre longer than 

 the minute and unappendaged glands. 



= = Seeds minutehj roughened or lorinkled ; leaves serrulate, and the 

 plant often hairy. 



E. glyptosp^rma, Engelin. Glabrous or rarely slightly puberulent, 

 erect or spreading ; leaves linear-oblong and mostly falcate, very unequal 

 at the base, serrulate near the obtuse apex ; stipules lanceolate and cut ; 

 seeds sharply 4-angled, marked with 6 or G sharp transverse wrinkles. 

 Ontario, W. 



E. macul^ta, Linn. Prostrate ; leaves oblong-linear, very oblique at 

 base, sirrulate above, blotched in the center ; pods sharp-angled, very 

 small, witii 4 shallow grooves. Common along roads and in dry fields. 



E. humistrata, Engelm. Procumbent, hairy, or puberulent ; leaves 

 elliptic or t)bovate, very oblique at the base, sparsely hairy underneath, 

 sometimes with a brown spot on the upper side ; involucre cleft on the 

 back, the truncate or crenate appendages red or white ; seeds ovate, 

 obtusely angled and minutely roughened. Rich places, Jnd., W. 



E. Preslii, Guss. Ascending 10'-2U' high ; leaves ovate-oblong or 

 linear-oblong, serrate, often with red spot or margins ; appendages 

 entire ; pod blunt-angled ; seeds ovate, obtusely angled, wrinkled and 

 tubercled, blackish. Common. 



++ ++ Leaves opposite or ivhorled at the top of the stem, alternate or scat- 

 tered heloio, larger ; plants strict. 



E. marginata, Pursh. Snow ox thic Mountain. Wild on the plains 

 W. of the Mississippi, and cult, for ornament; leaves pale, ovate or oval, 

 sessile, the lower alternate, uppermost in threes or pairs and broadly 

 white-margined ; fiower-cup with 5 white petal-like appendages behind 

 as many saucer-shaped glands. Stout, 2°-8° high. 



E. coroUata, Linn. Gravelly or sandy soil, from N. Y., S. and W.; 

 2'^-o° high ; leaves varying from ovate to linear, entire, the lower alter- 

 nate, upper whorled and opposite ; flower cups umbelled, long-stalked, 

 with 5 bright white conspicuous appendages, imitating a 5-cleft corolla. 21 



+- +- Glands of the involucre destitute of petal-like appendages. 



** Involucres (or "flowers'''') in terminal clusters, loith few or solitary 

 glands ; all, or the ^ippermost, leaves opposite, variable ; stipules small 

 and glandular. ® 



E. dentata, Michx. Rich soil from Penn. S. and W. ; hairy, only the 

 lower leaves alternate, the upper opposite, varying from ovate to linear, 

 uppermost paler or whitish at base, and the few glands of the flower cup 

 short-stalked. 



E. heterophylla, Linn. Glabrous ; leaves alternate, ovate and sinuate- 

 toothed, or tiddle-shaped, or some of them lanceolate or linear and 

 entire ; the upper with red base ; no petal-like appendages to the flower 

 cup and only 1 or 2 sessile glands. Minn., S. 



■^+ -w- Involucres in a terminal forked or nmhel-like inflorescence, icith 4 or 

 5 entire or crescent-shaped glands ; plants ascending or erect, generally 

 glabrous ; stipules 0. 



= Leaves of the commonly erect stem alternate or scattered ; those of the 

 umbel-like inflorescence whorled or opposite and of different shape, 

 usually roundish; glands of the flower cup mostly 4. Weeds or weed- 

 like. 



II Glands of the flower cup or involucre transversely oval and obtuse, (i) 



E. platyphylla, Linn. Nat. from Ku. N.; upper stem-leaves lance oblong- 

 acute, minutely serrulate ; uppermost heart-shaped ; floral ones triangu- 



