260 Engelmann and Gray, 



limbo e basi-cordata valde producto lineari acuminato tubo 

 angusto multo longiore. — Shady, grassy places near Mill 

 creek. April — July. A remarkable species, with a very 

 long and simple aromatic root, and several weak, decumbent 

 stems branching from the base, about a span high. Leaves 

 three to five inches long, and one to three lines wide ; the 

 attenuated limb of the perigonium as long as the leaves. 

 Capsule glabrous. 



299. A. reticulata, Nutt. in Trans. Amer. Phil. Soc. 

 (N. Ser.) V. p. 162. Thickets west of the Brazos. May — 

 June. — Root similar in sensible properties to that of A. ser- 

 pentaria, but of coarser fibres ; and also used medicinally as a 

 snake-root. 



300. Euphorbia herniarioides, Nutt. 1. c. p. 171. Clayey 

 soil, near Industry. July — September. Also in Mississippi, 

 Missouri, &c. The smallest of our procumbent Euphorbiae ; 

 the leaves from a line and a half to two or three lines long, 

 obliquely obtuse or subcordate at the base. Glands of the 

 involucre narrowly petaloid-margined. Cocci smooth and 

 somewhat carinate. Seeds grey marked with reddish, obo- 

 vate-oblong, obtusely angled, smooth. 



301. E. arenaria (Nutt. 1. c.) : annua, erecto-patula, gla- 

 bra ; foliis oppositis distantibus linearibus integerrimis obtusis 

 mucronatis basi subobliqua acutis breviter petiolatis ; stipulis e 

 basi lata subulatis distinctis subintegris ; pedicellis petiolos 

 longe superantibus solitariis ; appendicibus involucri petaloi- 

 deis plerumque 4-ovatis subacutis insequalibus ; seminibus 

 obovato-subglobosis loevibus e rubello cinereis. — Sandy places, 

 especially about fresh ant-hills, near Industry ; also on sand- 

 stone rocks. June — August. Forming large bushy masses, 

 often six feet in circumference, and two feet or more in height. 

 Its slender habit, long and narrow leaves, and conspicuous white 

 flowers, give it somewhat the appearance of a large Galium. 1 



1 A remaining species of the stipulate division of this genus is 

 E. Geyeri, (Engcl. MSS.) : depressa, humilis ; foliis oblongis retusis integer- 

 rimis glaberrimis ; stipulis setaceo-multifidis ; involucri appendicibus petaloideis; 

 seminibus minoribus quam in E. polygonifolia cinereis. — Beardstown, Illinois, 

 and Upper Missouri, Geyer. Near E. polygonifolia. 



