Part 1, 1922] * AMBROSIACEAE 35 
ulent or hispidulous above; heads paniculate, the staminate ones above the pistillate ones; 
involucre rotate, 5-6 mm. broad, rather deeply cleft; lobes 9-12, lanceolate; paleae of the 
receptacle subulate, pubescent; corolla pubescent; style rather thick, fully as long as the 
stamens; stigma peltate, penicillate; pistillate heads 2-3-flowered; fruit pubescent, elliptic- 
fusiform, 8-9 mm. long; beaks 2, more or less united below, elongate-conic, slightly hooked; 
spines 7-10, in about 3 series, subulate, pubescent, hooked at the apex. 
Type Locaity: [Given as] “from Santa Gertrudis to Cabo San Lucas,’’ but the type was 
collected at Ascension, Lower California. 
DISTRIBUTION: Lower California. 
, 
33. Franseria Sanctae-Gertrudis Rydberg, sp. nov. 
A tall shrub, 2-3 m. high, with white stems; twigs canescent-hispidulous when young; 
leaves alternate, short-petioled; blades ovate or ovate-lanceolate, 4-8 cm. long, hispidulous 
and green on both sides, but slightly paler beneath, coarsely and sinuately toothed, more or 
less acuminate; heads paniculate, the staminate ones above the pistillate ones; involucre rotate, 
5 mm. broad, finely pilose; lobes 5-7, triangular; paleae of the receptacle subulate or filiform, 
sparingly hairy; corolla pubescent; style thick; stigma peltate, penicillate; pistillate heads 
mostly 2-flowered; fruit pilose, about 6 mm. long; beaks 2, spreading, terete, hooked at the 
apex; spines about 15, in 3 series, subulate, pilose, hooked at the apex. 
Type collected on rocky slopes at Santa Gertrudis, Lower California, 1898, Purpus 116 (ZS: 
Nat. Herb. no. 383387.). 
34. Franseria flexuosa A. Gray, Proc. Am. Acad. 20: 298. 1885. 
A low shrub, widely branching; twigs canescently puberulent when young, glabrate and 
purple-tinged, flexuose; leaves alternate, short-petioled; blades 3-5 cm. long, deltoid-lanceolate, 
coriaceous, sinuately iobed or toothed, with salient spinulose ceeth, caudate-acuminate, 
feather-veined, and reticulate, canescently puberulent on both sides; heads paniculate, the 
staminate ones mostly above the pistillate ones; involucre of the former rotate, 4 mm. broad, 
villous; lobes 5-7, ovate; corolla pubescent; styles thick; stigma peltate, penicillate; pistillate 
heads 2-3-flowered; fruit 7 mm. long, glandular-granuliferous and villous; beaks 2 or 3, as- 
cending, subulate; spines rather thin, lance-subulate, channeled and with a deep pit in their 
axils, not hooked at the apex. 
TYPE LOCALITY: Cafion Cantillas, within the border of Lower California. 
DISTRIBUTION: Northern Lower California. 
X. Chenopodifoliae. Shrubs; leaf-blades ovate, lanceolate, or deltoid in outline, toothed; 
staminate involucre with 8-10 triangular or deltoid lobes; paleae spatulate to linear-clavate, 
villous; anthers with acute inflexed tips; fruit 2- or 3-celled, pubescent; beaks 2 or 3, subulate 
or conic, not hooked at the apex; spines subulate, not hooked at the apex. 
35. Franseria deltoidea Torr. Pl. Frém. 15. 1853. 
Gaertneria deltoidea Kuntze, Rev. Gen. 339. 1891. 
A shrubby perennial; branches finely tomentose at first, glabrate in age; leaves simple, 
petioled, finely tomentose, in age glabrate above; blades deltoid to rhombic-lanceolate, trun- 
cate or cuneate at the base, acute at the apex, crenate; heads in terminal racemes, the staminate 
ones several; peduncles short, 3 mm. long or less; involucre saucer-shaped, tomentulose when 
young; lobes 8-10, broadly triangular; paleae narrowly linear-clavate, membranous, 1-nerved, 
villous; pistillate heads more or less clustered on the lower part of the raceme, subtended by 
small ovate, mucronate or cuspidate leaves, 2- or 3-flowered; fruits globose, with a turbinate 
base, about 6 mm. long, slightly tomentose when young, more or less glandular, 2-celled; beaks 
2 or 3, subulate, about as long as the spines; spines 15-30, glandular, more or less flattened, in 
2-4 series, the lower series of 8-15, very broad, leaf-like and connate at the base, straight, the 
upper narrower. 
TYPE LOCALITY: On the Gila River, southern California [now Arizona]. 
DISTRIBUTION: Southern Arizona. 
