204 PROCEEDINGS OF THE AMERICAN ACADEMY 



Tanacetum potentilloides. Artemisia potentilloides Gray, 

 Proc. Am. Acad. 6, p. 551. The hirsute receptacle is peculiar. The 



cies. Dr. Engehnann communicated styliferous specimens whicli seem to be 

 hybrids between this species and H. autumnale. 



■>- -I- Ligulee styUferae fertiles : receptaculura serai-§-globosum. 

 ++ Capitula mediocria vel majuscula : pappi palese corolla breviores. 



10. H. AUTDMNALE Linn. Caule ad apicem usque folioso plerumque corym- 

 boso-polyceplialo ; foliis lato-lanceolatis nunc serratis ; pedunculis saepius brevi- 

 bus. — II. grandijionun & H. montanum Nutt. 1. c. — Atlantic States and Canada 

 to the Pacific. 



11. H. BiGELOvii Gray, Bot. Whipp. p. (107) 51. Caule gracili ssepius simplici 

 monoeephalo ; pedunculo elongato ; foliis a linearibus ad lato-lanceolata integer- 

 rimis ; capitulo saepius majore. — Variat caule ramoso ligulis brevioribus. — 

 California. 



++ ++ Capitula magna, disco primum heraisphaerico pollicem diametro, ligulis 

 poUicaribus : pappi paleae aristatae coroUam disci sub^quantes : pedunculi 

 longi validi, saepius fistulosi, sub capitulo turbinato-incrassati ut in Leptopoda. 



12. H. BoLANDERi Gray in Proc. Am. Acad. 7, p. 358. — Northern part of 

 California along the coast, Bolander. — The small paleae of the pappus are mostly 

 sparingly laciniate-toothed, the teeth more or less prolonged and bristle-shaped. 



§ 2. Leptopoda. {Leptopoda Nutt.) Ligulae numerosEe neutrae. Pappi paleas 

 SEepe lacerates vel fimbriatse, costa nulla seu evanida. Caulis simplex e 

 radice perenni, virgatus, apice plerumque longe nudo monocephalus. Caet. 

 Euhelenii. 



# Receptaculum ovato-conicum : discus demum subglobosus : folia plerumque 

 integerrima, fere glabra, pi. m. elongata, lanceolata, superiora linearia : 

 achenia ad angulos hirsuta. 



13. H. FiMBRiATUM Gray. Bi-tripedale, gracile ; capitulo sat magno (disco 

 ultra-semipollicari) ; pappi paleis ultra medium in setas plurimascapillaressolutis. 

 — Gray in E. Hall, List, Pi. Tex. no. 360. GaiUardia Jimbriata Michx. Lepto- 

 poda fimhrkttalovv. & Gray, Fl. 2, p. 387. — Florida to Texas. Rays three- 

 fourths of an inch long. Disk in fruit 3 or 4 lines high, foveolate witli the 

 borders of tlie areolse corneous, as in H. vernale. 



14. H. CuRTisii. Praecedenti simile; capitulo minore; pappi paleis lato- 

 obavatis subintegerrimis corolla disci fere triplo brevioribus. — Leptopoda hrevi- 

 folia var. Torr. & Gray 1. c. L. integrifoUa M. A. Curtis, Mss. — Near Raleigh, 

 North Carolina, M. A. Curtis. 



* * Receptaculum vix hemisphaericum : discus convexus. 



-4- Achenia glaberrima, immaturis resinoso-atomifera : pappi palese pi. m. lace- 

 ratse, setulae hand rare aristellatae. 



15. H. Ndttallii. — Leptopoda Helemnm &, L. denticulata Nutt. L.decuirens 

 Macbride in Ell. — South Carolina to Florida and Louisiana. Foliage nearly as 

 in H. Jimbriatum ; the stem less tall. — Var. incisum ? Leptopoda incisa Torr. & 



