84 PROCEEDINGS OF THE AMERICAN ACADEMY 



•»— Pili achenii gracilia, copiosa, simplicissima, nonnulla apice 2-3-fida, 

 lobis vel deiiticulis parum patentibus acutis vel acutiusculis : capitula 

 mediocria, iiivolucro minus imbricato, pedunculo saepius nudo : ligulae 

 roseo-purpureae, rarius albte : annuse vel biennes, occidentales. 



++ Pappus radii plurisetosus disci conformis vel brevior. 

 T. FLORIFER. Spithamuea, cinereo-hirsuta ; caulibus e radice annua 

 gracilibus ; foliis linearibus imisve subspathulatis acutis nunc apiculato- 

 acuminatis ; involucri bracteis lineari-lanceolatis parum ina^qualibus. 

 T. strigosa. Gray in Wilkes Exped. xvii. 344, non Nutt. Erigeron 

 Jlorifer, Hook. Fl. Bor.-Am. ii. 20. Aplopappus Jlorifer, Hook. & 

 Arn. Bot. Beech. 351. Stenotus Jlorifer, Torr. & Gray, Fl. ii. 238.— 

 Sandy banks of the Columbia River and its tributaries (as far north 

 as Wenass Valley, Lyall), and in the dry region east of the Cascades. 

 T. SCAPIGERA, Eaton. Humilior, hirsuto-pubescens ; caulibus sca- 

 piformibus (inferne 1-2-foliatis) ; foliis radicalibus spathulatis, lamina 

 saepius lata brevi ; involucri bracteis latiuscule lanceolatis. Bot. King, 

 145, t. 17. Aplopappus jlorifer, var. Hook. & Arn. 1. c. ? — Moun- 

 tains of N. Nevada and N. E. California, Watson, Lemmon, Mrs. 

 Austin. 



Var. CAULESCENS, Eaton, 1. c, is a summer form, becoming sparingly 

 leafy-stemmed, slender, and with rather smaller heads. — Monitor Val- 

 ley, Nevada, Watson. 



Var. AMBiGUA is still more leafy-stemmed, with white rays, and the 

 pappus in the ray shorter than that of the disk. — Rabbit Valley, 

 Utah, Ward. 



++ ++ Pappus radii setoso-squamellatus latitudine achenii brevior. 



T. Watsoni. Pube brevi adpressa subcinerea: caulibus e radice 

 gracili patentibus saspe ramosis parceque foliatis ; foliis anguste spathu- 

 latis ; capitulis sat numerosis brevi-pedunculatis ; bracteis involucri 

 oblongo-lanceolatis ; pilis achenii brevibus obtusis vel apice dentibus 

 2-3 obtusis instrnctis. T. strigosa, Eaton, 1. c, non Nutt. — Utah, 

 on the shore of Stanbury Island, Great Salt Lake, Watson. 

 H— ^— Pili achenii aut omnes aut pliirimi glochidiato-capitellati, i. e. 



apice breviter bidentati, dentibus obtusis recurvis subglandulosis ? 



++ Capitulum sat magnum (|-pollicare) ; involucro pluriseriatim im- 

 bricato : plantae fere glabra, depresso-acaulescentes e radici perenni : 

 folia plana, inferne longe attenuata, coriacea, capitulum longe super- 

 antes. 

 T. WiLCOXiANA, Wood. Foliis lineari-spathulatis (1-3-pollicaribus) ; 



