76 



NORTH AMERICAN FLORA 



[Volume 34 



49. BAERIA* Fisch. & Mey. Ind. Sem. Hort. Petrop. 2 : 29. Ja 1836. 



Bitrrielia DC. Prodr. S: 663. 1836. 



Ptilomeris Nutt. Trans. Am. Phil. Soc. II. 7: 381. 1841. 



Dichaela Nutt. Trans. Am. Phil. Soc. II. 7: 383. 1841. 



Plants mostly annual, glabrous or pubescent. Leaves opposite, sessile, narrow, entire to 



laciniate-pinnatifid. Heads mostly many-flowered, pedunculate. Involucre cylindric to 



hemispheric, consisting of 3-15 distinct or slightly united herbaceous bracts, these either 



nearly plane or becoming somewhat carinate below, often with a tendency to embrace their 



achenes. Receptacle from subulate to hemispheric, mostly conic, muricate, or scrobiculate 



and the depressions conforming to the bases of the achenes. Ray-flowers present, but the 



ligules sometimes minute, yellow. Disk-corollas with narrow tube, campanulate throat, and 



5-lobed limb, yellow. Style-tips truncate-capitate to ovate, with or without a central apicu- 



lation. Achenes 4-angled, or somewhat flattened and each face then 1 -nerved, clavate-linear 



or narrowly cuneate. Pappus of awns or squamellae, sometimes of both awns and squa- 



mellae, not infrequently wanting. 



Receptacle subulate. (Burrielia.) 



Heads apparently discoid, the ligules shorter than the style or wanting; 



involucre nearly cylindric. 1. B. microglossa. 



Heads radiate, the ligules 2-5 mm. long; involucre turbinate to campanulate. 



Leaves nearly filiform; anther-tips subulate. 2. B. leptalea. 



Leaves linear to lanceolate; anther-tips only acute. 3. B. debiUs. 



Receptacle conic to subglobose. 



Herbage' neither glandular nor viscid; receptacle muriculate. 



Pubescence hirsutulous or strigulose; leaves mostly ciliate towards 

 the base and entire or nearly so. (Eubaeria.) 

 Plants biennial or perennial, with thickened roots; pappus of few 



bristles or none. 4. B. macrantha. 



Plants annual; pappus of squamellae (either awned or awnless) or 

 none. 

 Leaves narrowly linear, acute; bracts of the involucre oblong- 

 ovate, acute. 5. B. chrysostoma. 

 Leaves broadly linear or oblong, obtuse; bracts of the involucre 



round-ovate, somewhat obtuse. 6. B. hirsulula. 



Pubescence all soft or woolly, often sparse or almost none ; leaves entire 

 to pinnately parted. 

 Involucre turbinate, its bracts keeled by the strong midrib; pappus 



uniform or wanting. (Platycarpha.) 7. B. platycarpha. 



Involucre hemispheric, its bracts not keeled; pappus dimorphous. 

 (Dichaeta.) 

 Receptacle conic, not hirsute. 



Ligules of the ray-flowers elliptic-oblong, mostly 4—8 mm. 



long, exceeding the disk. 8. B. uliginosa. 



Ligules of the ray-flowers oval, mostly 1-3 mm. long, scarcely 



equaling the disk. 9. B. maritima. 



Receptacle dome-shaped, obtuse, densely hirsute as well as muri- 

 cate. 10. B. Fremontii. 

 Herbage more or less glandular or viscid; receptacle usually scrobiculate; 



pappus paleaceous or none. (Ptilomeris.) 11. B. aristata. 



1. Baeria microglossa (DC.) Greene, Fl. Fran. 438. 1897. 



Burrielia microglossa DC. Prodr. 5: 664. 1836. 

 Lasthenia microglossa Greene, Man. Bay Reg. 205. 1894. 

 Pentachaeta laxa Elmer, Bot. Gaz. 41: 318. 1906. 



Annual, 0.5 to 2 dm. high, usually much branched, the stems weak and slender but erect, 



sparsely pubescent with soft and somewhat appressed hairs; leaves linear, entire, rarely more 



than 3 mm. wide, usually much narrower; peduncles 1-4 cm. long; involucre cylindric, 5-8 mm. 



high, its 3 or 4 bracts oblong and acute; receptacle subulate; ray-flowers (pistillate) 1-3, their 



ligules shorter than the styles or wanting; disk-flowers not more than 15 ; style- tips short-ovate; 



achenes slightly compressed, nearly linear but narrowed below, rough with scattered upwardly 



pointing minute bristles; pappus of 2-4 very narrow but flattened squamellae attenuate into 



subulate awns, sometimes wanting in the ray-flowers. 



Type locality: California. 



Distribution: Shaded or grassy places in western and middle California, extending to the 

 borders of the Mojave and the Colorado deserts. 

 Illustration: E. & P. Nat. Pfl. 4 6 : /. 1?A, H. 



* By Harvey Monroe Hall. 



