492 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Palmer, no. 699). Differing from F. laxa, Vahl, in its paler smaller 

 spikelets and smaller white and glossy achenes. 



F. Holwayana. Culms slender, 1 to 3 dm. high, much overtopping 

 the pale greeu narrow (0.75 mm. wide) ciliate leaves : umbel simple, 

 with 2 (rarely 1) to 4 ovoid-oblong spikelets 6 to 8 mm. long, 2.5 to 3.5 mm. 

 thick, the middle (or rarely solitary) one sessile, the others on slender 

 ascendiug rays 0.5 to 2 cm. long ; involucre of 2 or 3 ciliate leaves, the 

 longest one usually much exceeding the rays: scales from orbicular 

 to ovate, blunt, castaneous and shining, the green midrib in the outer 

 somewhat prolonged into a short awn, in the others barely into a cusp: 

 achene short-stipitate, pearly, broadly obovoid, subtruncate above, half 

 as long as the scale, 1.25 mm. long, nearly as thick, with about 16 lon- 

 gitudinal ribs, and many linear transverse markings ; style flat, fimbriate, 

 exserted. — Jalisco, Chapala, Sept. 18, 1899 (E. W. D. Rolway, no. 

 3-143). Closely related to F. pentastachya, Boeckeler, but differing in 

 its narrower spikelets and broader scales, and in the .achenes which are 

 smooth or with one or two tubercles at the very summit, not tuberculate- 

 roughened throughout as in F. pentastachya. 



F. obscura. Glaucous, loosely tufted from slender branching caudex : 

 leaves flat, 2 or 3 mm. wide, the longest 1.5 dm. long, smooth, or the 

 margins ciliolate-scabrous except at the acutish cartilaginous tip: culms 

 compressed, with thin edges, 4 dm. or less high : umbel decompound, 

 with 2 to 4 rays 2 or 3 cm. long and several shorter ones; involucre of 

 2 leaves much shorter than the umbel; spikelets mostly pedicelled, or 

 rarely 2 or 3 fascicled and sessile, lanceolate, acute, 5 to 8 mm. long, 1.5 

 to 2 ram. thick : scales dark brown, ovate-oblong, strongly carinate and 

 mucronate: style slender, terete, smooth, with 3 pubescent branches; 

 achenes trigonous with obtusish angles, obovoid, barely 1 mm. long, 

 whitish, with extremely obscure longitudinal markings (seen only under 

 strong magnification). — Durango, alkaline bottoms near Durango, 

 June, 1896 /'/"'. Palmer, no. 186) : San Luis Potosi, in the moun- 

 tains. San Miguelito, 1-S76 {SchafTnrr, no. 558). Resembling F. 

 autumnalis, R. & S., but clearly differing in its caespitose perennial 

 habit, and its larger, paler, and duller achenes. 



Glyphosperma Palme bi, Watson, Proc. Am. Acad, xviii. 161. 

 Mr. Pringle calls attention to the fact thai thi- plant, which in Mexico 

 appears like an introduced -pedes, is identical with the Old World 

 Asphodelus Jistulosiu, L. 



Cologania Deamii. Stems slender, 1.5 to 2 dm. long, from aslen- 

 der creeping rootstock, ascending and branched, the tips flexuous but 



