378 EUPHORBIACEAE 
Flowers in axils of the opposite leaves not in umbel-like clusters, usually one 
only, 
Plant prostrate. a. 
Borders of leaves without fects «fe oe) lw te Bn Pelyconinorme 
Borders of leaves with teeth. 
Stem and leaves without hairs . . . . . E, glyptosperma 
Stem and leaves hairy. 
Involucres split on one side . . . . . E. humistrata 
Involucre’ “not ‘split’ ..° 3 Ge) “= 9.9. s!) - 3 eons 
Plant erect. 
[Leaves:; notched. 6 ue ite, el ey oe ce las E. nutans 
Leaves entire . ap E, “Ipecacuanhae 
Flowers in umbel-like clusters subtended by a * whorl of leav es. 
Appendages to involucre petal-like . ... +» « « « « «+ + &, corollata 
No petal-like appendages. 5 
Rays of the umbel 3 rarely more. Stem leaves with leaf 
StalkSn ects ao Wen vel ie Sie ls) of 6’ "el? eh ee ee 
Rays of the umbel 4 «Mee ee we tie a ie |e eee 
Rays of the umbel 5 to 8. 
Floral leaves broad heart-shaped. 
Stem leaves elliptic lance-sshaped . . E. Darlingtonii 
Stem leaves pear-shaped . . - EE, helioscopia 
Stem leaves oblong, blunt at each end - « &. lucida 
Stem leaves linear, sharp at both ends. 
Whorl of leaves at base of umbel not repeated 
aoghs he eee oee . « BB. Bula 
Whorls 2 to several, one below the other on 
main stem. © « « « « «© « J. cyParinns 
1. E. polygonifolia, L. (Fig. 2, pl. 88.) Sra-sipe Spurce. Stems 
spreading, prostrate, 3 to 8 in. long, lying flat upon the sand. Leaves 
4 to ? in. long, opposite, very narrow with blunt ends, fleshy, borders 
not serrated. Flowers, a single involucre at the axil of one of a pair of 
leaves, seeds egg-shaped. Sandy shores. July-Sept. 
2. E. glyptosperma, Engelm. RuipGE-SEEDED SpurGeE. Smooth, pros- 
trate, spreading, stems 2 to 15 in. long. Leaves oblong or narrow, 
broader at base, and generally very unequal there; blunt at each end, 
borders with small serrations toward the blunt apex. Involucres often 
clustered; seeds 4-angled. June-Oct. 
3. E. maculata, L. (Fig. 3, pl. 88.) Mirxk Purstane. Hairy, both 
leaves and stem. Stems prostrate, much branched, 2 to 15 in. long. 
Leaves about 4 in. long, reddish, usually blotched with a brown-red spot 
near center, oblique at base with small serrations toward the apex. 
Flowers in dense leafy axillary clusters. Seeds ovate with 4 sharp angles 
and 4 shallow grooves. Common, sandy places. June-Nov. 
4. E. humistrata, Engelm. Harry Spreapinc Spurce. Resembles 
No. 3, but leaves are less hairy beneath and color of leaves and stems 
light green. Leaves about 1/3 to 1/2 in. long, oblong or oval. Invol- 
ucres in lateral clusters, split on one side. Aug.-Oct. 
5. E. nutans, Lag. (Fig. 8, pl. 88.) Larce or Upricut Sporrep 
Spurce. Stems upright, simple or more generally branching above 4 to 
2 ft. high. Leaves opposite, irregularly and unsymmetrically oblong, 
slightly notched on the borders. Flowers white or red. Common in 
sandy soil. May-Oct. 
6. E. corollata, L. (Fig. 7, pl. 88.) Frowrertna Spurce. Erect, 
1 to 3 ft. high, bright green, simple below, branched as an umbel above. 
Leaves forming the whorl subtending the umbel, narrow, 3 to 6, those of 
the stem narrow lance-shaped, alternate, those of the umbel also narrow 
