180 NORTH AMERICAN FLORA [Volume 34 



3-toothed; disk-corollas 7 mm. long; tube 1-1.5 mm. long; lobes triangular-lanceolate, glandu- 

 lar-puberulent ; achenes 7 mm. long, short-hirsute; squamellae 7 mm. long, the body nar- 

 rowly-lanceolate, rather abruptly contracted into a long hispidulous awn; bristles 3-5 mm. 

 long. 



Type locality: Near Guajuquilla, Chihuahua. 



Distribution: Western Texas, New Mexico, and Coahuila. 



Illustrations: A. Gray, PI. Wright, pi. 8; E. & P. Nat. Pfl. 4«: /. 126, D. 



3. Nicolletia trifida Rydberg, sp. nov. 



A low perennial; stem about 2 dm. high, branched, bushy, glabrous, striate; leaves alter- 

 nate, pinnately divided into 3-5 linear mucronate segments, each with a gland at the very 

 tip; peduncles 0.5-2 cm. long; involucre turbinate, 10-12 mm. high; principal bracts about 10, 

 linear-lanceolate, acuminate, with a single gland near the apex; accessory bracts 1-4, 

 lanceolate, less than one fifth as long as the involucre proper; ligules flesh-colored, about 8 

 mm. long, entire or sinuately 3-toothed; disk-corollas 6-7 mm. long; tube 1 mm. long; lobes 

 lanceolate; achenes 6 mm. long; squamellae 4-6 mm. long, 3-cleft at the apex, the middle 

 lobe with a short awn less than one fourth the length of the body; bristles unequal, 3-5 

 mm. long. 



Type collected at Los Angeles Bay, Lower California, 1887, Palmer 569 (herb. Columbia 

 Univ.). 



Distribution: Lower California. 



17. LEUC ACTINIA Rydberg, gen. nov. 



Perennial herbs with slender branching caudex. Leaves alternate, but crowded at the 

 base, filiform, conspicuously glandular-dotted. Heads radiate, peduncled, terminal. In- 

 volucre turbinate, without calyculum; bracts 8-15, obovate or oblanceolate, thickened and 

 herbaceous below, scarious above, rounded or truncate at the erose apex, and with 2 series of 

 oil-glands. Receptacle alveolate. Ray-flowers 8-15, pistillate and fertile; ligules oblong, 

 white. Disk-flowers numerous, hermaphrodite and fertile; corollas yellow; tube shorter 

 than and gradually passing into the narrowly funnelform throat ; lobes 5, short. Style-branches 

 elongate, recurved with capitate tips. Achenes elongate, linear-cylindric. Pappus simple, 

 of 10-20 scabrous bristles. 



Type species, Pedis bracteata S. Wats. 



1. Leucactinia bracteata (S. Wats.) Rydberg. 



Pedis bracteata S. Wats. Proc. Am. Acad. 25: 155. 1890. 



A perennial, with a slender branching caudex; stems glabrous, angled, 2-3 dm. high, densely 

 leafy towards the base, scapiform above; leaves filiform or nearly so, 2-6 cm. long, subulate- 

 tipped, the upper reduced and bract-like; involucre 7-8 mm. high, nearly 1 cm. broad; 

 ligules about 8 mm. long, 3-4 mm. wide, white, dark- veined in age; disk-flowers 50-65; corollas 

 6 mm. long; achenes 4.5-5 mm. long, glabrous; pappus-bristles slightly dilated and linear-sub- 

 ulate below, 4.5-5 mm. long. 



Type locality: Carneros Pass, Coahuila. 

 Distribution: Known only from type locality. 



18. CHRYSACTINIA A. Gray, Mem. Am. Acad. II. 4: 93. 1849. 



Low glabrous shrubs. Leaves opposite or alternate, simple or pinnatifid. Heads radiate, 

 peduncled, terminal, solitary. Involucre hemispheric or nearly so; bracts 8-12, linear, distinct, 

 in a single series, each with a solitary oil-gland,. Receptacle corneo-alveolate. Ray-flowers 

 few, pistillate and fertile; ligules linear, yellow or orange. Disk-flowers many, hermaphro- 

 dite and fertile; corolla- tube shorter than the cylindric or trumpet-shaped throat; lobes 5, 

 ovate or triangular. Style-branches elongate, narrowly linear, flat, with a short conic 

 appendage. Achenes elongate, linear-cylindric, striate, hispid. Pappus simple, of hispidu- 

 lous-scabrous bristles longer than the achenes. 



Type species, Chrysactinia mexicana A. Gray. 



