162 NORTH AMERICAN FLORA [Volume 34 



ones. Ray-flowers 8-12, pistillate, fertile; ligules broadly oblong or oval. Disk-flowers many, 

 hermaphrodite and fertile; corolla-tube cylindric, about equaling the trumpet-shaped throat; 

 lobes lanceolate. Style-branches with a short conic appendage. Achenes clavate, angled, some- 

 what pubescent on the angles. Pappus of 10-20 squamellae, each dissected into 5-10 bristles. 

 Type species, Dyssodia anthemidifolia Benth. 



Leaves entire or with a few broad lobes. 1. B. lilorale. 



Leaves pinnatifid into linear fleshy divisions. 



Involucre depressed-hemispheric; bracts united at the base only; ligules 



yellow. 2. B. anthetnidi folium. 



Involucre rather broadly campanulate; bracts united to the middle; 



ligules white. 3. B. concinnum. 



1. Boeberastrum litorale (Brand.) Rydberg. 



Dyssodia litoralis Brand. Zoe 5: 163. 1903. 



A glabrous annual; stem branched and spreading from the base; branches 6-15 cm. long; 

 leaves alternate, fleshy, generally entire, spatulate, 2-5 cm. long, 4-6 mm. wide, sometimes 

 with short broad lobes; glands midway between the margin and the midrib or in the lobed 

 leaves marginal; peduncles terminating the branches, 1-2 cm. long; involucre hemispheric, 

 2 cm. broad; bracts obtuse, broadly oval, scarious-margined, about 7 mm. long; ligules 5-6 mm. 

 long; disk-corollas 4 mm. long, puberulent; tube fully 1 mm. long, much shorter than the 

 funnelform throat; achenes 3 mm. long, hirsute; squamellae about 20, each dissected into 5- 

 10 bristles. 



Type locality: Sand drifts, 15 miles south of Pescadero, Lower California. 



Distribution: Lower California. 



2. Boeberastrum anthemidifolium (Benth.) Rydberg. 



Dyssodia anthemidifolia Benth. Bot. Voy. Sulph. 29. 1844. 



A branched annual; stem erect, 1-3 dm. high, glabrous; leaves alternate or the lower 



opposite, 3-5 cm. long, pinnatifid into 3-9, fleshy, linear-filiform divisions, each with a round 



gland near the apex, and mucronate; peduncles terminating the branches, slightly thickened 



above, with a few linear bracts remote from the head; involucre hemispheric, naked at the 



base, about 6 mm. high and 12 mm. broad; bracts 8-10, oval, rounded at the apex, membranous 



above, in two subequal series, united at the base only, with 3-5 glands; ray-flowers 8; ligules 



oval, obtuse or retuse, 8 mm. long; disk-corollas 4 mm. long, glabrous; tube much shorter 



than the funnelform throat; achenes 3 mm. long, hirsute on the angles; pappus 3 mm. long; 



squamellae 12-15, each divided into 6-10 bristles. 



Type locality: Bay of Magdalena, Lower California. 

 Distribution: Lower California. 



3. Boeberastrum concinnum (A. Gray) Rydberg. 



Hymenatherum concinnum A. Gray, Syn. Fl. N. Am. I 2 : 446. 1884. 

 Dyssodia concinna B. L. Robinson, Proc Am. Acad. 49: 507. 1913. 



A depressed annual; stem branched at the base; branches spreading, glabrous glaucescent; 

 leaves alternate, fleshy, 1-2 cm. long, pinnately parted into linear obtuse divisions; heads sub- 

 sessile and clustered at the summit of the leafy branches; involucre subhemispheric or short- 

 campanulate, about 6 mm. high and fully as broad; bracts 12-14, united fully half their 

 length, with 2 rows of rounded glands; free portion ovate, scarious-margined; ray-flowers 

 10-12; ligules oblong, white, 4-5 mm. long; disk-corollas yellow, about 5 mm. long, glabrous; 

 tube about equaling the trumpet-shaped throat; achenes clavate, 3.5 mm. long, angled, 

 sparingly hairy on the angles; pappus 2.5 mm. long; squamellae 10, dissected into 5-7 bristles. 



Type locality: [Near Tucson], Arizona. 

 Distribution: Arizona. 



6. LEBETINA Cass. Diet. Sci. Nat. 25: 395. 1822. 



Glabrous annuals. Leaves pinnately parted with rounded sinuses, oblong to obovate 

 segments, and conspicuous elliptic glands. Heads radiate or discoid. Involucre turbinate, 

 of 15-20 subequal bracts, subtended by several pectinately dissected accessory ones, nearly as 



