w- 



Franseria. COMPOSITE. 345 



§ 1. Fertile involucre 1-2-celled, armed with several stout or flattened and straight 



or men/;/ curved spines. 



* Annual : spi?ies on the fruit very flat and broad. 



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

 pinnatifid, either given or strigosely hoary beneath : racemes panicled : fruiting 

 involucre smooth or sometimes sparingly hirsute, about 3 lines long ; its widely 

 spreading spines lanceolate-subulate and thin. — Ambrosia acanthicarpa, Hook. 



Eos Angeles, Brewer. Eastern borders of the State, Mono Lake, Bolandcr. Thence common 

 to Oregon, Texas, Nebraska, &c. Involucre apparently always one-flowered and one-celled. 



* * Perennial, sometimes woody at base. 



+- Leaves twice or thrice pinnately parted, their ultimate divisions small. 



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

 high, canescent with line 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. — Rep. Frem. 2nd Exp. 31G. F. albicaulis, Torr. PI. 

 Fremont. 1G. 



Gravelly plains, southeastern borders of the State, Coulter, Sc/wU, Cooper, &c. Also in Arizona. 



3. F. pumila, Xutt. Herbaceous, a span high, canescently silky-hirsute : " rool 

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

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



Near San Diego, Nullall, Parry. All the specimens seen are young, and the fruit unformed. 

 But Delpind (Studj sopra Artem.), who makes of this a genus (Bemiambrosia), says that the 

 upper fertile involucres are 2-celIed and 2-llowered, the lower one-celled and one-flowered. Nut- 

 tall assigns short spines to the fruit. Very probably this species is a dwarf state of F. tenuifolia. 



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

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



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

 short, stout, conical-subulate, flattened. 



Along the sea-shore from San Hiego to British Columbia. Fruiting involucre 4 or 5 lines 

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



-f- -f- Lnir,s itii'/irii/rit nr nitrify incised. 



5. F. Chamissonis, lass. Herbaceous: stems trailing, a foot or two long. 

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

 cuneatc-oblong, contracted at base into a lung petiole, uneiptally and obtusely ser 

 i ite, sometimes incised, rarely almost pinnatifid : spike dense : fruiting involucre 

 sparsely hirsute; its spines very stout and flatfish. — F. Cliamissonis, var. malvce- 

 folia, Less. F. cuneifulin, Xutt. 1. c. 



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



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

 cent with a line and .lose woolliness, which is partly deciduous with age : branches 

 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 rocemed : spines of the ovoid 2-flowered involucre flat and 

 thin, broadlj lanceolate- subulate, pubescent or almost glabrous. — PI. Fremont. 

 15, <v I'.ot. Mex. Bound. 86. 



Southeastern frontiers of tfii State common on the Gila : also in Lower < California it', as is 

 probable, tins is also F. chenopoditfolia, Bonth. Bot, Sulph. 26, the older name. 



7. F. eriocentra, dray. Shrubby, low, hoary-pubescent: branches slender: 

 leaves varying from cuneate to lanceolate, sparingly incised : leads mostly glomerate : 

 fruiting involucre and i i - rigid nearly terete subulate spines clothed with Ion 



Ions wool. -- I'roe. Am. Acad. vii. 355. 



