208 PEOCEEDINGS OF THE AMERICAN ACADEMY 



the species have been described ; but, as Bentham shows, Microseris is 

 identical with Eucalais, except, I would add, in the number of the 

 pappus-palece. — From it, however, Mr. Bentham distinguishes Scorzo- 

 nella Nutt., even placing it in another subtribe. In revising these 

 plants for the Californian flora, I find myself unable to adopt this con- 

 clusion. The basal callosity of the achenium, hollowed at the inser- 

 tion, is shared by Microseris proper throughout. As to the remaining 

 character, that of the graduated imbrication of the scales of the 

 involucre, there is a transition (as also in the pappus) through M. 

 sylvatica to the section Ptilophora, and through 31. Parry i to the 

 other sections. And 3f. aphantocarpha, with all the other characters 

 of Eucalais, has the pappus-scale more obsolete than in any form of 

 M. laciniata, the long bristle being undilated, except at its very inser- 

 tion. The species may be disposed under five sections, as follows.* 



* MICROSEEIS Don, Benth. & Hook. 



§ 1. Ptilophora. Pappi aristae (14-22) albo-plumosse : achenia nee apice vix 

 inferne attenuata, teretia : invohicrum calyculatum vel imbricatum. Bi- 

 ennes, radicibus fusiformibus. — Ptilophora Gray, PI. Fendl. p. 112. Calais 

 § Ptilophora Gray, in Bot. Whipp. 



1. M. NUTANS. Scorzonella {Crepis Geyer) nutans Hook. Calais nutans 

 Gray, 1. c. Stephanomeria intermedia Kellogg. — Gracilis ; involucrum fere bi- 

 seriale, squamis exterioribus brevibus calyculum efficientibus. 



2. M. MAJOR. Calais (Ptilophora) major Gray, I.e. cum syn. Calais gracili- 

 loba Kellogg in Proc. Calif. Acad. 5, p. 40, forma laciniato-pinnatifida. — Invol- 

 ucrum magis imbricatum triseriatum. 



§ 2. Scorzonella. Pappi aristae (8-10, raro pauciores) aut subplumosse sordi- 

 dce, aut nudae : achenia nee apice parum basi attenuata : involucrum imbri- 

 catum, squamis exterioribus gradatim brevioribus. Biennes, radice fusiformi. 

 — Scorzonella Nutt. Calais § Scorzonella & Anacalais Gray, in Bot. Whipp. 

 Scorzonella Benth. & Hook. Gen. PI. 2, p. 533. 



* Achenia gracilia Ptilophorce : pappus subplumosus vel barbellatus. (^Ana- 



calais Gray.) 



3. M. STLTATiCA. Scorzonella sylvatica Benth. PI. Hartw. Calais (Anacalais) 

 sylvatica Gray, in Bot. Whipp. I. c. 



Var. Stillmani : squamis involucri e basi angustiore sursum sensim attenu- 

 atis ; pappi aristis (quandoque) minus barbellatis. — Calais sylvatica, forma. Gray 

 in Bot. Whipp. 1. c. 



* * Achenia parum breviora, nunc 4-5-angulata, nunc teretia gracilia : aristae 



pappi tenuiter denticulatae vel scabrae. 



♦- Involucri squamae longius acuminata : pappus e paleis 8-10 parvis arista 

 praelonga capillar! superatis : ligulae elongatae. Caulescentes vel subcaules- 

 centes. 



