212 PROCEEDINGS OP THE AMERICAN ACADEMY 



PLUCnEA (Berthelotia) borealis. Tessaria borealis, Torr. & 

 Gray (§ Phalacrocline, Gray, PI. Wright), &c. Berthelotia lanceo- 

 lata, DC, being referred by Bentham to Pluchea, carries with it the 

 present plant. Tlie near affinity of the two, as well as the subcaudate 

 anthers, I had noticed in PI. Wrightianai, i. 102, but I did not carry 

 out the conclusion on account of the stoutness of the pappus-bristles. 

 — Tessaria, Ruiz & Pav., considering that the species are exclusively 

 South American, may be retained, and characterized by the narrow 

 heads and the long villosity of the small receptacle. 



Antennaria flagellaris. Capitula A. dimorphce sed minor, 

 floribus paucioribus ; caudice parvo simplici emittente flagellis scapi- 

 formibus gracillimis nudis (spithamajis) propagiue mox radicante et 



From the variations in the size of the heads and a difference in male in- 

 volucres, tliis may comprise two species. 

 B. SAROTiiEOiDES, Gray, supra. So far as known, this is confined to S. Califor- 

 nia along and near the Mexican frontier. 



* * * Of New Mexico, Arizona, and Mexico ; the branches terete and 

 lightly striate (not striate-angled as in the preceding and in most of our 

 species), minutely pruinose-roughened. 



B. PTEKOXioiDES, DC. Prodr. v. 410. B. ramulosa, Gray, PI. Thurb. .301, & 

 Bot. Mex. Bound. 84. Aplopappus ramulosus, DC. Linosyris (Aplodiscus) 

 ramulosa, Gray, PI. Wright. The specimen in the Candollean herbarium 

 appears to be tliis rather wide-spread and peculiar Mexican species. 



3. Pappus of the fertile flowers not longer than of the male, even in the fruit 

 not surpassing tlie style, therefore not elongating in age, ratlier rigid and 

 scanty : akenes lO-nerved, but the intermediate nerves sometimes indistinct : 

 fertile corollas regularly and acutely 5-tootlied : receptacle bearing some chaffy 

 scales similar to involucral bracts among the outer flowers, becoming hemi- 

 spherical or conical when these are numerous : liranches herbaceous from a 

 woody base ; the fruitful ones bearing sparing small leaves, or naked, and 

 paniculate small heads. 



B. SEEGiLOiDES, Gray in Pacif. R. Rep. iv. 101, & Bot. Mex. Bound. 83, also 

 Bot. Calif, i. 333, but there mixed with B. sarothroides, &c. Desert of 

 S. E. California to Nevada and adjacent borders of Nevada and Utah. 



4. Pappus of the fertile flowers not flaccid, little if at all elongated in fruit, 

 mostly not copious : akenes only 4-5-nerved. 



* Scabro-puberulent or pubescent, not glutinous : fruiting pappus mani- 

 festly surpassing the style : heads loosely paniculate : bracts of the 

 involucre scarious with a green or greenish back or centre, acute or acu- 

 minate : stems herbaceous from a more or less woody base. 



B. BRACHYPHYLLA, Gray, PI. Wright, ii. 83. S. Arizona to the borders of 

 California. Very minutely puberulent. 



