ParT 1, 1922] AMBROSIACEAE 33 
25. Franseria dumosa A. Gray; Torr. in Frém. Rep. Calif. 316. 
1845. 
Gaertneria dumosa Kuntze, Rev. Gen. 339. 1891. 
A shrubby perennial, with divaricate subspinose branches, 3-6 dm. high; young branches 
cinerous, strigose; leaves 1-2 cm. long, ovate in outline, pinnately or bipinnately divided, 
grayish-strigose on both sides, both primary and secondary divisions obovate or elliptic, the 
latter about 2 mm. wide; inflorescence racemose, the pistillate heads often intermixed with 
the staminate ones, the latter on short peduncles; involucre about 5 mm. broad, saucer-shaped, 
canescent; lobes 5—8, oval or ovate; paleae of the receptacle with broad dilated rhombic-spatu- 
late tips, villous; corolla pubescent; anthers acutish; pistillate flowers and fruit similar to 
those of F. albicaulis, but the spines usually broader, lance-subulate. 
TyPE LOCALITY: Sandy uplands of the Mojave River. 
DISTRIBUTION: Mojave Desert, southern California and southern Nevada; near Yuma, 
Arizona. 
26. Franseria albicaulis Torr. Pl. Frém. 16. 1853. 
Franseria dumosa albicaulis A. Gray, in Torr. Bot. Mex. Bound. Surv. 87. 1859. 
A low branched shrub, 2 dm. high or more; branches numerous, finely tomentose when 
young; leaves 1-3 cm. long, pinnatifid or bipinnatifid, with oblong divisions, which are about 
1 mm. broad, finely canescent; heads rather few, racemose, the pistillate and staminate ones 
often intermixed; staminate head on peduncles 1-3 mm. long; involucre saucer-shaped or 
somewhat turbinate, about 3 mm. wide, canescent; lobes 7 or 8, broadly ovate; paleae linear- 
spatulate, l-nerved, somewhat pubescent; anther-tips triangular, incurved; pistillate heads 
2-flowered; fruit 4-5 mm. long, globose, somewhat glandular-puberulent; beaks 2, conic-subu- 
late, straight; spines 30-40, subulate, flat, not hooked, 2 mm. long. 
Type Locauiry: “Southern California, probably on the Gila’”’ [now Arizona]. _ 4 
DistRIBuTION: Southern Utah to southern California, Sonora, and Lower California. 
27. Franseria Magdalenae Brand. Proc. Calif. Acad. II. 2: 170. 
1889. 
A suffrutescent perennial, 3-6 dm. high, branching, strigose-puberulent; leaves 5-7 cm. 
long oval or ovate in outline, bipinnatifid, strigose above, somewhat tomentose beneath, the 
divsions lanceolate and toothed; inflorescence simple, racemose or the pistillate heads some- 
times in small clusters; peduncles of the staminate heads about 3 mm. long; involucre 30-40 
flowered, 5 mm. broad, saucer-shaped, strigose; lobes 5-10, ovate; paleae of the receptacle 
filiform; anthers obtuse, distinct; pistillate heads subtended by small oblong or lanceolate 
leaves, mostly 2-flowered; fruit ovoid, 5 mm. long; beaks 2, conic, subulate, shorter than the 
spines; spines 20-25, in about 4 series, subulate, slender, 3 mm. long, hooked at the apex. 
TYPE LocaLity: Magdalena Island, Lower California. 
DISTRIBUTION: Lower California. 
28. Franseria intricata Rydberg, sp. nov. 
An intricately branched low shrub; young branches cinereous-tomentulose; leaves 2-4 
em. long, grayish-tomentulose on both sides, almost white beneath, bipinnatifid, with divari- 
cate divisions; rachis slightly margined; ultimate segments linear-oblong, 1 mm. broad; heads 
in terminal spikes or racemes, the staminate above the pistillate ones; involucre saucer-shaped, 
4-5 mm. wide, dark, sparingly pilose and puberulent, crenate; paleae of the receptacle linear- 
oblanceolate, sparingly villous towards the end; corolla pubescent; anther-tips acutish; pistil- 
late heads 2-flowered; fruit about 5 mm. long, glandular-pruinose; beaks 2; spines about 40; 
beaks and spines-both subulate, 2.5-3 mm. long, hooked at the apex. 
Type collected at San Bartolome Bay, Lower California, March 13, 1911, J. N. Rose 16196 
(herb. N. Y. Bot. Gard.). 
VIII. Cordifoliae. Shrubs, with brown branches; leaf-blades ovate or cordate, 3-7- 
lobed; heads racemose; staminate involucre 5—10-crenate; paleae filiform, with spatulate 
