Frnni^erin. COMTOSITyE. ' o^c 



§ 1. Fertile involucre \-2-celled, armed with several stout or fattened and stravjht 



or merely curved spines. 



* Annual: spines on the fruit very flat and broad. 



1. F. Hookeriana, Nutt. A foot or so high, rough-hirsute: leaves twice 

 pinnatihd, either green or strigosely hoary beneath : ra.^cmes panicled : fruitin<r 

 involucre smooth ov sonietunes sparingly hirsute, ahout 3 lines Ion" • its wi.lelv 

 spreading spines lanceolate-subulate and thin. — Ambrosia amnthicarpa, J look. 



Lo. AnKolos. Bvcurv. Knston. lu,r,lors of tl.o Stnto, M„no T>nk.. Botamhr. Tl.onro rmnmo.i 

 to Oiojron, Icvivs, Ncl)iivskn, &c. li.voluoio ap|miontly always ono-ll..w(M(!.l and ono-collo<l. 



* * Perennial, sometimes woody at base. 



+- Leaves twice or thrice pi nnat el y parted, their ultimate divisions small. 



2. F. dumosa, Gray. Shrubby and divergently much branched, a foot or so 

 high, canescent with hue and close white pubescence : leaves with rather few obtuse 

 lobes, some of them only simply pinnatifid : fruiting involucre nearly glabrous ■ the 

 spines flat and subulate. — Kep. Frem. 2nd Exp. 31G. F. albicaultJi Tor/ PI 

 Fremont, 16. , . . 



Gravelly plains, southeastern borders of the State, Coulter, Schotl, Cooper, he. Also in Arizona. 



3. F. pumila, Nutt. Herbaceous, a span liigh, canescently silky-hirsute : " root 

 creeping": leaves thrice pinnatifid, the lobes crowded : spike dense : "spines of the 

 fruit not exserted." — Nutt. in Trans. Am. Phil." Soc. n. ser. vii. 344. 



Near San Diego, NuftaU, Parry. All the specimens seen are yoni.g, and the fruit unfonned 

 hut Delpino (Studj sopra Artem.), who makes of tliia a Reims {Ilnninmhrosin) says that tlin 

 nj.per fertile involucres are 2-cellcd and 2-llow(MTd, the lower one-coll.Ml and onc-llowered. Nnt- 

 tall assigns sliort spines to the fruit. Very i)rol.al)iy tliis species is a dwarf Avibrosia tmuifolia. 



4. F. bipinnatifida, Nutt. Herbaceous : stems decumbent or trailing, 2 or 3 

 feet long, somewhat hirsute : loaves twice or thrice pinnatifid, canescently hirsute or 

 almost silky: spike dense: fruiting involucre ncariy glabrous; its spines rather 

 short, stout, conical-subulate, flattened. 



Along the sea-shore from San Diego to British Columbia. Fraiting involucre 4 or 5 Hues 

 long, rather narrow. Perhaps, as Lessing supposed, a form of the next. 



-t- "*- Leaves undivided or merely incised. 



5. F. Chamlssonis, Less. Herbaceous : stems trailing, a foot or two long, 

 stout, appressed-hirsute : leaves silky-canescent or silvery, varying from oval to 

 cuneate-oblong, contracted at base into a long petiole, unequally and obtusely ser- 

 rate, sometimes incised, rarely almost pinnatifid : spike dense : fruiting involucre 

 sparsely hirsute ; its spines very stout and flattish. — F. Chamissonij<, var. malv,v- 

 folia, Less. F. cuneifolia, Nutt. 1. c. 



Sea-shore, in sand, from San Francisco north to British CoUinibia. 



6. F. deltoidea, Torr. Herbaceous with more or less woody base, low, canes- 

 cent with a hnoaiKl close woollinoss, which is partly deciduous with nge : branrho,s 

 slender : leaves varying from deltoid-ovate or almost hastate to rhombic-lanceolate, 

 obtusely and finely serrate, sometimes sparingly incised, on slender petioles : sterile 

 heads rather loosely racemed : spines of the ovoid 2-flowered involucre flat and 

 thin, broadly lanceolate subulate, pubescent or alino.st glabrous. — PI. Fremont. 

 15, & Jiot. Mex. I5ound. 80. 



Southonstern frontiers of the State : common on the Gila : also in T,ower Galifoniia if, as is 

 prolmhle, tills is also /'. chninpodiij'olin , Hcnth. Hot. Snlpii. 20, the older name. 



7. F. eriocentra, Gray. Shrubby, low, hoary-pubesrent : branches slender : 

 leaves varying from cuneato to lanceolate, sparingly inrisod : heads mostly glomerate : 

 fruiting involucre and its rigid neariy terete subuhite spines; rj.ithcd with long vil- 

 lous wool. — Proc. .\m. Arad. vii. 3.'^5. 



