196 PROCEEDINGS OF THE AMERICAN ACADEMY 



very short and few rays and the slender receptacle, than upon the form 

 of the appendages of the style. The difference is not great between 

 those of Burrielia leptalea Gray, with slender subulate appendage 

 abruptly contracted from a broad basal portion, and those of Burrielia 

 now Bceria platycarpha, which are truncate-capitate, but flat, with short 

 central cusp ; and in other Bcerice this cusp is represented by a more 

 or less obvious, or sometimes evanescent, setiform point. B. maritima 

 has short rays, indeed, but they are broad and flat, and the receptacle 

 is broadly and obtusely conical. The species of Bceria are as below.* 



* BiERIA Fisch. & Meyer, Benth. & Hook. 



§ 1. Pappus semper nuUus ; achenia apice rotundata, areola epigyna parvula. 

 Folia integerrima. [Bceria Fisch. & Meyer.) 



1. B. CHRTSOSTOMA Fiscli. & Meyer., cum var. macrantha, Burrielia chry- 

 sosloma var. macrantha Gray in But. Wliipp. — Varies from these largest to 

 depauperate and slender forms, with rays and involucral scales reduced to 5 

 or 6. 



§ 2. Pappus uniformis, ex aristis paleisve aristatis 2-7, raro nullus 1 Achenia 

 apice truncata, areola epigyna lata. [Burrielice sp. DC. etc.) 



* Folia integerrima. 



2. B. GRACILIS. Burrielia gracilis DC. — Eeceptaculum angustissime coni- 

 cum, acutissimum : pappus ex aristis (in radio 2-3, disco 4-5) basi angusta 

 sensim paleaceo-dilatatis. — In some specimens the awns are scarcely dilated at 

 base, in others the paleaceous portion is lanceolate or almost ovate-lanceolate. 



3. B. TENERRiMA. Burrielia tenerrima DC. B. parvijlora & B. lunyifolia ? 

 Nutt. — Eeceptaculum latiuscule conicum parum acutum : pappus ex aristis 

 tenuibus 2-5 basi in paleam late ovatam subito dilatatis. — Both this and the 

 foregoing occur in very depauperate forms, eitlier of which may have been 

 De CandoUe's Burrielia tenerrima, but I take this to be it. As they are distinguish- 

 able only by the pappus, they perhaps run together. 



* * Folia in eadem stirpe integerrima et tripartita : pedunculus sursum crassior : 

 pappi paleae 6-7, oblongo-ov^atas, aristae sequilongse. 



4. B. PLATYCARPHA. Burrielia plati/carpha Gray. 



§ 3. DiCH^TA. Pappus blformis, nempe ex aristis 2-7 cum paleis multo brevi- 

 oribus muticis interjectis, nunc in eadem spec, nullus. Achenia areola 

 epigyna latiuscula. Folia saltern infima pinuatifida vel laciniata. (Dichceta 

 Nutt.) 



» Folia pleraque integerrima, lato-linearia : ligulae breves. 



5. B. MARITIMA. Burrielia (Dichceta) maritima Gray. Pappus ex aristis 3-5 

 validis et paleolis pluribus angustis laciuiatis interpositis. 



* * Folia nonnulla tri-pluripartita : ligulae majores. 



6. B. Fremontii. Dichceta Fremontii Torr. Burrielia Fremontii Benth. PI, 

 Hartw. ; forma epapposa, an semper 1 Folia angustissime linearia, nunc integer- 



