38 PROCEEDINGS OF THE AMERICAN ACADEMY 



Tagetes, Tourn., is so natural that no question of its limitation has 

 been raised. Its involucre varies from oblong-campanulate to tubular 

 or to ovate and ventricose. The akenes are augulate or compressed, 



fere semipollicari, setis pauciusculis rigidulis. — This is not identical witli 

 Clomenocoma montana of Bentiiam, as lie (in Addenda to PI. Ilartw. 351) has 

 suggested. 



D. SQUAMOSA. Folia trifollolata, foliolis ovatis petiolulatis serratis : bractca; 

 accessorial scariosce, apiculato-acuminatie vel niutica;, propriis vix breviores : 

 pappi palea3 setis nunierosis inollibus. — Di/sodia appendiculaia, Schultz Bip. in 

 Bot. Herald, non Lag. — Northern part of Mexico, Gregg, no. 1061. Seemann, 

 1991. 



-*- •»- Bracteai accessorise angustae. 



D. Ai'PENDiCDLATA, Lag. Nov. Gen. & Spec. 29. Folia pinnata paucijuga: 

 involucri bracteae accessoriae uumerosae, subulataj vel setaceo-attenuatae. — Aster 

 Americanus, etc. Houst. llel. t. 18. A. aurantius, L. Clomenocoma auranlia, Cass. 

 Diet. ix. 416, lix. G6; DC. 1. c. Clappia aurantiaca, Bentli. Ic. PI. xii. 3, t. 

 1104; unless, indeed, the involucre is quite correctly delineated in the figure as 

 to the pluriserially imbricated bracts. If so, it is a peculiar but otherwise 

 similar species. 



D. .MOXTANA. Folia ovata seu ovato-lanceolata, indivisa et serrata, summisve 

 inciso-pinnatifida : involucri bracteae accessorias paucae, lineares. — Clomenocoma 

 monUtna, Benth. PI. Hartw. 86; Hook. Bot. Mag. t. 5310, excl. syn. DC. Prodr. 

 Comacliniu/n aurantiactim, Scheidw. & Planclion, Fl. Serres, t. 756. Di/sodia 

 grandijiora, Hemsl. Bot. Biol. Centr.-Am. ii. 219, non DC. — Guatemala and 

 Nicaragua. 



* * Eeceptaculum brevissime fimbrilliferum, pubescens, vel subalveolatum : 

 bracteie accessorial tenuiter subulata3 vel setaceaj : achcnia glaberrinia vel 

 minute puberula, pappo breviora : plantaj plerumque glaberrimaj, ramosaj, 

 caulibus basi sublignosis vel frutescentibus. 



*+ Folia omnia opposita, trifoliolata, petiolis petiolulisque gracilibns. 

 D. SPECIOSA, Gray, Proc. Am. Acad. v. 1G3. Lower California, Xuntus. 

 ++ ++ Folia omnia vel plera alterna, laciniato-pinnatipartita, raro indivisa. 

 = Styli rami ex apice obtuso subpenicillato subito tenuiter appendiculati : 

 folioruni lobi et involucri bractCEB accessoriae seta tenuissima protracta 

 terminati. Spec, duae, Mexicaniie, pappo tantuni diversae, in priore {Lebetina, 

 Cass.) anomalo. 



D. CANCELL.vTA. Pappus duplcx, extcrior e paleis 10 brcvibus oblongis vel 

 obovatis coriaceis integerrirais aj)ice quandoque denticulatis vel paucisetuliferis. 

 — Z?. Poro/)%//«Hi, Willd. Enum. 900, non Cav. Lebetina cancellala, Cass., DC. 

 Bcchera Porophijllum, Less. Adenoj>Jii/Uum Porophi/l/um, Ilemsl. Biol. Centr.-Am., 

 maini}'. — This appears to be usually more robust than the following, more 

 conspicuously radiate, and the paleaceous portion of the inner or ordinary pap- 

 pus is more conspicuous and firmer than in the following. But the two probably 

 had a not remote common ancestry. 



D. poKOi'iivLLA, Cav. Anal. Cienc. vi. 3-34; DC. Prodr. v. 639. Pteronia Poro- 

 phjllum, Cav. Ic. iii. 13, t. 225, discoid form. Bahera Porophijllum, IIBK. Ade- 



