128 PROCEEDINGS OF THE AMERICAN ACADEMY 



leaflets three to five, thick, obovate, obtuse, coarsely toothed, lialf an 

 inch long or less : peduncles mostly terminal, equalling the leaves : 

 flowers numerous, spicate upon a short rhachis (only two lines long), 



* * Flowers sessile or nearly so. — Western species. 



1- Caulescent, often tall. 



++ More or less pubescent : calyx-teeth very narrow, much longer than the tube, 

 plumose or hairy : stipules lanceolate, acuminate. 



6. T. ERiocEPHALUM, Nutt. Usually spreading-villous : leaflets oblong : 

 flowers in dense ovate liearls, at length reflexed : teeth filiform, lax, very plu- 

 mose : ovary hairy. — N. California to Oregon and Idaho. 



7. T. PLUMOSUM, Dougl. Somewhat appressed-villous : leaflets elongated, 

 narrowly oblong to linear : heads oblong or ovate ; flowers not reflexed : teeth 

 straight, plumose : ovary smooth. — Oregon, Idaho. 



8. T. LONGiPES, Nutt. Stem usually glabrous : leaflets shorter, narrowly 

 oblong, mostly very acute : heads ovate, smaller and looser : teeth straight, more 

 or less hairy. — Var. latifolium. Hook. Often low : leaflets broader : flowers 

 pedicellate in loose heads. — From the Rocky Mountains to the Pacific. 



++ ++ Glabrous throughout : calyx-teeth subulate, rigid, contorted, twice longer 

 than the tube : flowers sessile : stipules lanceolate, acuminate. 



9. T. ALTissiJiuM, Dougl. Stout: leaflets narrowly oblanceolate, acute. — 

 Oregon, Idaho. 



++++++ Glabrous throughout : calyx-teeth straight, scarcely longer than the 

 tube : stipules mostly ovate, acute, entire : flowers on very short pedicels, 

 at length reflexed. 



10. T. Beckwithii, Brewer, ined. Stout : leaflets oblong to oblanceolate, 

 obtuse or acute, 1 or 2 inches long, coarsely veined and tootlied : flowers 7 to 9 

 lines long, in dense globose heads : teeth linear-subulate : ovary 2-6-ovuled. — 

 T. ultissimum, Torr. & Gray, Pacif. R. Rep. 2. 120. N. E. California to S. Idalio. 



11. T. KiNGii, Watson. Smaller and more slender : leaflets usually narrow 

 and acuminate: flowers 4 to 7 lines long, in looser heads. — Bot. King's Rep. 

 59. T. Haydeni, Porter, Hayden's Rep. 1871, 480. N. E. California to Mon- 

 tana and Utah. 



12. T. BoLANDERi, Gray. Cespitose, decumbent : leaflets small, bro^nd and 

 obtuse, very finely reticulated, slightly serrulate : flowers few, 3 or 4 lines long : 

 teeth lanceolate, scarcely as long as the tube: ovules 2. — Proc. Am. Acad. 7. 

 335. Yosemite Valley. 



-t- +- Dwarf, cespitose, acaulescent or nearly so. — Rocky Mountains to Utah. 



++ Glabrous : flowers large : ovary smooth, linear, 8-ovuled. 



13. T. NANUM, Torr. Leaflets small, oblanceolate, serrulate : flowers 1 to 3, 

 6 to 9 lines long : calyx-teeth broad, acute. 



14. T. BuAXDEGEi, Watson. See p. 132. 



