OF ARTS AND SCIENCES. 195 



but with the reduced strictly ternate bracts of the subgenus Ganysma, 

 smoother invohicres, narrower perianth-segments, and glabrous akenes. 



Euphorbia (Zygophyllidium) Plummek^e. Erect and slender, 

 from a subglobose or fusiform tuberous root, dichotomously branched, 

 puberulent, about a foot high : leaves opposite, the lowest oblong-, the 

 rest linear, an inch long by 1 or 2 lines wide, abruptly narrowed to a 

 short slender petiole ; glandular stipules obsolete : involucres mostly soli- 

 tary, narrowly campanulate, half a line long and about equalling the 

 pedicels ; lobes quadrate, inflexed, lacerate ; gland-appendages half as 

 long as the involucre, rounded, entire : styles slender, united at base, 

 bifid: capsule glabrous, depressed, 2\ lines broad: seeds globose, 

 without caruncle, smooth and dark-colored with a thin lighter-colored 

 scurfiness, a line in diameter. — On the " Sentinel " in Tanner's Canon, 

 Huachuca Mountains, Southern Arizona ; collected by J. G. Lemmon 

 and Mrs. S. Plummer Lemmon, July, 1882 (n. 2874). Closely 

 resembling forms of E. bi'formis (see page 151), excepting in the slen- 

 der styles, the larger capsules, and different seeds. 



MiCROSTYLis PURPUREA. Stem a foot high, with an obtuse pur- 

 plish sheath at base and a single clasping acutish oblong-ovate to 

 oblong leaf, 3 inches long : raceme elongated, at length loosely 

 flowered; pedicels 1 to 1^ lines long: flowers small, purple, the 

 linear-oblong sepals 1^ lines long and exceeding the linear petals; lip 

 triangular-lanceolate, slightly auricled at base : capsule round-ovate, 

 about 2 lines long, exceeding the pedicels. — In Tanner's Caiion, Hua- 

 chuca Mountains, Southern Arizona ; J. G. and S. P. Lemmon, July, 

 1882 (n. 2881). 



MiCROSTYLis CORYMBOSA. Stem 6 to 8 inches high, with 1 or 2 

 obtuse greenish sheaths at base, and a single acute or acutish clasping 

 cordate-ovate leaf, 2 to 4 inches long: raceme contracted (^ to 1 inch 

 long), the pedicels 3 or 4 lines long, becoming in fruit 6 lines long: 

 flowers pale greenish yellow, the oblong acutish sepals l^ lines long, 

 exceeding the very narrowly linear sepals ; lip broadly cordate, rather 

 abruptly long-acuminate, not auricled at base, thin : capsule oblong- 

 ovate, 3 or 4 lines long. — In the same locality ; J. G. Lemmon, July, 

 1882 (n. 2882). 



Allium Plumjier^. Bulb oblong, rhizomatous : leaves flat, linear, 

 2 or 3 lines wide, nearly equalling the scape, which is a foot high or 

 more : umbel erect, few-flowered ; bracts 2, long-acuminate, an inch 

 long and equalling the slender pedicels : corolla white, the lanceolate 

 acute segments 4 lines long, slightly exceeding the stamens: capsule 

 prominently crested. — In the same locality and by the same enthu- 

 siastic and indomitable collectors (n. 2893). 



