210 PROCEEDINGS OF THE AMERICAN ACADEMY 



that the scales of the involucre are united at base for nearly one-third 

 of their length (as may best be seen from within), and that the stout 



Bot. Mex. Bound, p. 164. Apparently a common species in the neighborhood 

 of San Francisco; wherefore it is singular that neither Douglas nor Nuttall col- 

 lected it. 



11. M. DouGLASii. Acheniis gracihoribus fusiformibus (s£epe lin. 3| longis) ; 

 pappi paleis ovato-oblongis ovatisve extus villosis apice in aristam sat vali- 

 dani breviter attenuatis. — Calais Douglasii DC. Prodr. 7, p. 85 ; Hook. & Arn. 

 Bot. Beech, p. 361. Collected, as far as I know, only by Douglas. Character- 

 ized from his specimens in the Kew herbarium (herb. Hook, and herb. Benth.). 

 According to ray notes, only some achenia are in De Candolle's herbarium, and 

 there is no mention in them, any more than in De Candolle's Prodromus, of the 

 copious villosity of the paleffi of the pappus, which is described by Hooker and 

 Arnott, and could hardly be overlooked in their specimens. This may sometimes 

 be wanting, as in the following species, to which ilf. Douglasii also approaches in 

 the texture and form of the paleae. [From observations communicated by 

 Dr. Miiller, the Curator of De Candolle's herbarium, it appears that the plant 

 described in the Prodromus is the same as that in the Kew herbarium, perhaps 

 with the palese of the pappus rather wider.] But the slender and truly fusiform 

 achenia, tapering almost as much to the summit as to the base (nearly as in 

 Calocalais), seems well to distinguisli it both from the preceding and the follow- 

 ing species. Its rediscovery is very desirable. 



■I- -t- Orbiculatis seu latissime ovatis subito ai'istatis : achenia brevia, valida, sub 

 apice baud vel pauUulum constricta. 



12. M. CTCLOCARPHA. Pappi aristis gracilibus palea sua 2-3-plo longioribus. 

 — Calais cyclocarpha Gray in Bot. Whipp. 1. c. t. 18. — Palese of the pappus 

 usually glabrous or nearly so, but occasionally bearing a few long villous hairs 

 on the back, so as to connect to this species the 



Var. ERiocAEPHA : pappi paleis extus sericeo-villosis arista vix dimidio 

 brevioribus. — Calais eriocarpha Gray, Proc. Am. Acad. 6, p. 552. 



13. M. PLATTCARFHA. Pappi aristis palea sua 2-3-plo brevioribus. — Calais 

 plati/carpha Gray in Bot. Whipp. & Bot. Mex. Bound. 1. c. — Of this only Dr. 

 Parry's original specimen is yet known. The young achenia do not show the 

 slight neck of the preceding species. 



§ 5. Calocalais. Pappus baud plumosus, saepissime 5-paleaceus : achenia 

 gracilia, fusiformia, sursum sensim nunc rostratim attenuata : involucrura 

 subduplex, squamis exterioribus paucis infequalibus, omnibus lanceolatis. 

 Subcaulesceutes, pedunculis scapiformibus simplicissimis, liguUs abbreviatis 

 pallidis ? — Calais § Calocalais DC. 



» Pappi paleae 5, oblongse seu lanceolate, apice mox lacerato-bifidas et ex sinu 

 aristam tenuem proferentes. Annual, radice exili. 



14. M. LiNDLETi. Acheniis praesertim extimis vix minusve rostratim atten- 

 uatis ; pappi rufescenti-sordidi paleis aclienio suba^quilongis scaberulis oblongo- 

 lanceolatis, costa valida ex emarginatura in aristam scabram ipsa parum breviorem 



