166 NORTH AMERICAN FLORA [Volume 34 



A perennial herb; stem angled and striate, 5-12 dm. high or more, glabrous; leaves oppo- 

 site, 3-5 cm. long, pinnate; leaflets 3-5, lanceolate, sharply serrate or incised, acuminate, 1-3 

 cm. long, glabrous; peduncles 5-15 cm. long; involucre 10-12 mm. high, 12-15 mm. broad, 

 turbinate-campanulate; principal bracts about 20, linear, acute, with 1-3 oblong glands near 

 the tip and with or without lateral narrowly linear ones further down; accessory bracts 

 about half as long, linear-subulate, with a single large gland; ligules orange, about 1 cm. 

 long; disk-corollas about 9 mm. long; lobes linear-lanceolate, 2 mm. long; achenes clavate, 

 striate; squamellae 10-15, each dissected into 5-8 bristles. 



Type locality: Vera Cruz. 



Distribution: Vera Cruz. 



Illustrations: Houst. Reliq. pi. 18; Hook. Ic. pi. 1104. 



6. Clomenocoma Cooperi (A. Gray) Rydberg. 



Dyssodia Cooperi A. Grav, Proc. Am. Acad. 9: 201. 1874. 

 Lebetina Cooperi A. Nelson, Bot. Gaz. 47: 435. 1909. 



A low perennial, with a woody base; stems several, with erect branches, 3-6 dm. 

 high, puberulent or in age glabrate and straw-colored; leaves all alternate, simple, sessile, 

 thick, puberulent, glandless, 1-2 cm. long, ovate or lanceolate, acute, scabrous, dentate with 

 salient, spinulose-tipped teeth; peduncles, 3-5 cm. long; involucre turbinate, 15 mm. high 

 and about as broad; principal bracts 20-30, linear-subulate, attenuate, some with and some 

 without glands, the glands, if present, near the apex and 1 or 2 lateral ones halfway up; 

 accessory bracts subulate, half as long, with a single gland and thickened at the base; fim- 

 brillae subulate, 1 mm. long; ligules orange, 8-10 mm. long, oblong; disk-corollas nearly 1 cm. 

 long; lobes lanceolate, fully 1 mm. long; achenes clavate, 6-7 mm. long, striate, glabrous; 

 squamellae 10-15, 6-8 mm. long, each dissected into 7-9 bristles. 



Type locality Southeastern border of California on the eastern side of Providence Mountains. 

 Distribution: Southern California, Nevada, and Arizona. 



7. Clomenocoma laciniata Rydberg, sp. nov. 



A perennial, with a woody base; stems about 3 dm. high, angled and sulcate, rather densely 

 puberulent, branched ; leaves sessile, 2-3 cm. long, puberulent, firm, the blade proper lanceolate, 

 incised-dentate with salient spinose teeth, those of the stem usually pinnately laciniate below 

 with lanceolate toothed lobes, those of the branches with one or two pairs of small subulate 

 lobes; peduncles 4-8 cm. long; involucre turbinate, 15-18 mm. high, 20-25 mm. broad; principal 

 bracts 15-20, linear-lanceolate, caudately long-attenuate, only some of them with 1 or 2 lateral 

 glands at the middle and none at the tip; accessory bracts subulate, half as long, with a single 

 gland; ligules narrowly oblong, 6-7 mm. long; disk-corollas 8 mm. long; lobes lanceolate; 

 squamellae about 10, 8-9 mm. long, each dissected into 9-11 bristles. 



Type collected at Hackberry, Arizona, May 24, 1884, M. E. Jones (herb. N. Y. Bot. Gard.). 

 Distribution: Type locality and vicinity. 



8. Clomenocoma porophylloides (A. Gray) Rydberg. 



Dyssodia porophylloides A. Gray, Mem. Am. Acad. II. 5: 322. 1854. 

 Lebetina porophylloides A. Nelson, Bot. Gaz. 47: 435. 1909. 



A perennial, with a thick woody base; stems glabrous, several, 2-4 dm. high, with strongly 

 ascending branches; leaves mostly alternate, 1-2 cm. long, pinnately dissected into 3-5 subulate 

 or lanceolate, spinulose-serrate or entire divisions, glandless, thick; peduncles 3-8 cm. long; 

 involucre turbinate, 12 mm. high and about as broad; principal bracts 14-20, linear, acute or 

 mucronate, the glands various, 1 or 2 terminal and median, and 1-4 lateral on each side; acces- 

 sory bracts subulate, about half as long, with a single gland; ligules orange, elliptic, about 

 5 mm. long; disk-corollas 8 mm. long; lobes lanceolate, often tinged with purple; achenes 

 5 mm. long, striate, hirsutulous; squamellae 10-12, 7-8 mm. long, each dissected into 7-11 

 bristles. 



Type locality: Sandy hills near San Felipe, between .San Diego and the Colorado, California. 

 Distribution: Arizona, southern California, and Lower California. 



