154 PROCEEDINGS OF THE AMERICAN ACADEMY 



* * * Cauline leaves linear, opposite : stems erect, delicate, much branched • 

 flowers short-pedicelled in the forks of a diffuse iiitiorescence. 



D. effasa, Gray. Viscid, especially upon the upper part of each 

 internode : radical leaves obovate, seldom persisting ; cauline very 

 narrowly linear, obtuse : sepals elliptic, obtuse, or scarcely acute, not 

 distinctly ribbed, considerably exceeded by the petals. — PI. Wriglit. 

 ii. 19; Torr. Bot. Mex. Bound. 37. — Mountainous districts, New 

 Mexico, Wright; Arizona, Rothrock, Lemtnon. (Adjacent Mexico, 

 Thurber.) 



D. tenella, Grat. In size and habit closely resembling the pre- 

 ceding, but glabrous and not viscid : sepals acutish, rather strongly 

 ribbed, a line in length, about equalling the petals. — PI. Feudl. 12, & 

 PI. Wright ii. 19. — Shady places, woodland, New Mexico, Fendler, 

 Wright, Greene. (Adjacent Mexico, Pringle.) D. nodosa, Engelm., 

 of Mexico, is a third closely related species, but has glandular stems, 

 and somewhat larger flowers with attenuate rather rigid sepals 1^-2 

 lines long. 



16. POLYCARPON, Lojfling (ttoXvs, much, many, and KapTro's, 

 fruit, from the innumerable capsules.) — A small genus of low, much- 

 branched annuals. Flowers numerous, cymose, very small. — Genus 

 ascribed to Loefling in Linn. Gen. ed. 6, n. 105 ; DC. Prodr. iii. 376; 

 Torr. & Gray, Fl. i. 173. 



P. TETRAPHYLLUM, L. Nearly or quite smooth : stems 2-6 inches 

 long, prostrate, or ascending: leaves quaternate or opposite, oblong 

 or obovate, obtuse, 2^-6 lines long, abruptly narrowed to short 

 petioles : stipules and bracts scarious, acuminate, the latter equalling 

 the rather sharply acuminate sepals : petals white. — Spec. ed. 2, 

 131 ; Eng. Bot. t. 1031 ; Ell. Sk. i. 182. — Introduced in S. Carolina 

 near Charleston and at Camden, Curtis. (Old World.) 



P. depressum, Nutt. Smaller : stems numerous, 1-2 inches long : 

 leaves opposite, spatulate, obtuse, attenuate to slender petioles : bracts 

 much shorter than the scarcely carinate sepals : petals very narrow or 

 subfiliform : capsule spherical. — Nutt. in Torr. & Gray, 1. c. 174; 

 Brew. &. Wats. Bot. Calif, i. 71. — Sand hills near San Diego, Niittall, 

 Cleveland ; near San Bernardino, Lemmon. (Lower Calif, Orcutt, 

 Palmer. ) 



17. LCEFLINGIA, L. (Dedicated to Peter Loefling, a Swed- 

 ish traveller and naturalist, born 1729.) — Small spreading glandular 

 somewhat rigid annuals, with subulate inconspicuous leaves, and ses- 

 sile solitary or more commonly fasciculate greenish flowers. — Gen. 

 ed. 6, n. 52 ; DC. Prodr. iii. 880. 



