76 



NORTH AMERICAN FLORA 



[V01.UME 34 



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



Burrielia DC. Prodr. 5: 663. 1836. 



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



Dichaeta 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-Iobed 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. 

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

 Leaves nearly filiform; anther-tips subulate. 

 Leaves linear to lanceolate; anther-tips only acute. 

 Receptacle conic to subglobose. 



Herbage neither glandular nor viscid ; receptacle muriculate. 



Pubescence hirsutulous or strigulo.=;e; 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. 

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

 none. 

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

 ovate, acute. 

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

 round-ovate, somewhat obtuse. 

 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.) 

 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. 

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

 equaling the disk. 

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

 cate. 

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

 pappus paleaceous or none. (Ptilomeris.) 



1. B. microglossa. 



2. B. leptalea. 



3. B. debilis. 



4. B. macrantha. 



5. B. chrysostoma. 



6. B. hirsulula. 



7. B. platycarpha. 



8. B. uliginosa. 



9. B. marilima. 



10. B. Fremontii. 



11. B. aristata. 



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



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

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

 Penlachaeta 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^: /. 1?.4, H. 



* By Harvey Monroe Hall. 



