ROBINSON AND GREENMAN. — MEXICAN PLANTS. 387 



Crusea coronata. Low : stem purple with spreading branches, 

 nearly or quite smooth : leaves linear, smooth, acute, 5-10 lines long, 

 1 line wide; margins revolute ; stipular sheaths very short, bearing on 

 each side 3-4 often ciliated bristle-formed teeth : flowers sessile, axillary 

 and terminal, single or less frequently in pairs subtended by two bracts 

 with their bristle-toothed stipular sheath : calyx segments linear, acute, 

 2-2h lines long : corolla very small, only a line long, 4-toothed at the 

 summit : stamens included, inserted near the base of the corolla tube ; 

 filaments slender : stigma 2-cleft; divisions of the fruit short, columnar, 

 minutely hispid, slightly enlarged at the summit and crowned with 

 a row of spreading bristles. — Collected on dry, rocky soil, Tequila, 

 3 October, 1893 (no. 5424). This species bears a habital resem- 

 blance to C. subulata, Hook. & Arn., but is well characterized hy its 

 crowned fruit. 



Gymnolomta patens, Gray, var. abbreviata. Stem 3-5 feet 

 high : petioles much shorter than in the type, about 2 lines in length : 

 heads rather closely grouped at the ends of the branches. — Collected 

 in ravines near Tequila, Jalisco, 21 September, 1893 (no. 4595). 



Gymnolojha rudis, Gray, var. minor. Leaves elliptic, smaller 

 than in the type, 2 inches long, | inch broad, reflexed : heads also 

 smaller, but 8 lines broad. — Collected on rocky hills near Tequila, 

 Jalisco, 7 October, 1893 (no. 4584). 



Viguiera Prtnglei. Shrubby, 5-10 feet high, scabrous : leaves 

 all but the uppermost opposite, elliptic or ovate, of firm texture, entire 

 or somewhat denticulate upon the strongly revolute margins, 3-nerved 

 and prominently reticulated beneath, 2^ inches long, 12-14 lines 

 broad, green and very rough upon both surfaces, sessile or subsessile, 

 obtuse and mucronate or acutish at the apex, obtuse at the base, 

 translucent-punctate : heads exclusive of the rays about 8 lines 

 in diameter, corymbose ; pedicels becoming an inch long in fruit : 

 involucral scales imbricated in about 5 series, linear-oblong, acute, 

 often apiculate, thickened in the middle, the outer regularly shorter ; 

 flowers yellow ; ligules 10-12, a half-inch in length, 2 lines broad, 

 shortly 3-toothed at the apex : achenes strongly flattened, black, 2 lines 

 long, silky-villous especially upou the margins, with upwardly pointed 

 hairs ; aristae 2, about half the length of the achene ; intermediate 

 scales several ; empty ray achenes triangular. — Collected in fruit by 

 Mr. Pringle on hills near Zapotlan, 12 May, 1893 (no. 4305). 

 Flowering specimens of the same plant, collected by Dr. Edward 

 Palmer, at Tepic, 5 January to 6 February, 1892 (no. 1979), have 

 been very kindly sent to us by Dr. J. N. Rose of the Department of 

 Agriculture. 



