28 NORTH AMERICAN FLORA [VOLUME 33 
above; blades ovate, oval, or obovate in outline, 3-10 cm. long; segments divergent, the ulti- 
mate ones linear or linear-oblong, acute; inflorescence rather simple, racemose or with a few 
branches; staminate heads reflexed on spreading peduncles, which are about 3 mm. long; in- 
volucre about 4 mm. wide, finely strigulose; lobes 8-10, rounded-ovate; paleae of the receptacle 
linear or filiform, with rhombic or broadly spatulate tips, or sometimes spatulate; pistillate 
heads in small clusters in the upper axils and on the lower part of the staminate raceme, 1- 
flowered; fruit 5-6 mm. long, glandular-puberulent, reticulate-rugose; beak solitary, conic; 
spines 8-15, in 2-3 series, dilated below, but not strongly flattened, some of them more or less 
hooked. 
TYPE LOCALITY: Aguascalientes. 
DISTRIBUTION: Chihuahua to Querétaro and state of Mexico. 
10. Franseria strigulosa Rydberg, sp. nov. 
A perennial herb; stem 3-6 dm. high, striate, strigulose or with a few coarser hairs; lower 
leaves 1-1.2 dm. long, bipinnatifid or tripinnatifid, softly grayish-strigulose on both sides, 
short-petioled, obovate in outline; segments oblong or linear-oblong, obtusish, or the terminal 
one lanceolate and longer; upper leaves less dissected; inflorescence a leafy panicle; staminate . 
heads short-peduncled, nodding; involucre 2.5—3 mm. broad, sparingly strigulose; lobes 6-8, 
triangular; paleae of the receptacle filiform, slightly clavate at the apex, sparingly glandular- 
puberulent and sparingly hispid at the tip; pistillate heads in small clusters on the lower part 
of the branches; fruit about 3 mm. long, pubescent and glandular-granuliferous, reticulate- 
‘ridged, 1-flowered; beak solitary, subulate-conic; spines 16-20, conic-subulate below, hooked 
at the apex. 
Type collected in Los Angeles County, California, September 1899, L. T. Chamberlain (herb. 
ING Ye ebot. Gard): 
DISTRIBUTION: Southern California, Lower California, Sonora, and Sinaloa. 
11. Franseria confertiflora (DC.) Rydb. 
Ambrosia fruticosa DC. Prodr. 5: 525. 1836. Not Ambrosia fruticosa Medic. 1775. 
Ambrosia confertiflora DC. Prodr. 5: 526. 1836. 
A perennial herb, 3-20 dm. high, in the south sometimes becoming woody at the base, 
very leafy and branched; stem appressed-hispid; leaves bipinnately or tripinnately and in- 
terruptedly dissected, short-petioled, strigose-hispidulous on both sides, 5-15 cm. long; seg- 
ments linear or linear-oblong, acute, the terminal ones elongate; heads in more or less leafy 
panicles, the staminate ones numerous, reflexed on spreading peduncles, which are 1-2 mm. 
long; involucre turbinate-hirsutulous and glandular-puberulent, 2-2.5 (rarely 3) mm. broad, 
irregularly lobed; lobes 8-10, broadly triangular, ciliolate; paleae of the receptacle filiform, 
with spatulate pubescent tips; corolla pubescent; teeth triangular; pistillate heads in small 
clusters in the upper axils and on the lower part of the staminate racemes, 1-2-flowered; fruit 
ovoid, 2-3 mm. long, glandular-puberulent; beak single, conic, incurved at the apex; spines 
6-18, connected by ridges, somewhat dilated below, more or less hooked at the apex, each 
with a reticulate pit or areola above its base. 
TYPE LOCALITY: Matamoros, Tamaulipas. ; 
DISTRIBUTION: Tennessee; from Oklahoma and southern Colorado to Arizona, Sinaloa, and 
Tamaulipas. 
12. Franseria Pringlei Rydberg, sp. nov. 
A perennial herb; stems 3-6 dm. high, sparingly strigulose and hispid; lower leaves 
petioled, tripinnatifid, strigose, sparingly hispid on the veins; blades ovate or rhombic in out- 
line, 5-8 em. long; segments short, ovate, divergent, acutish; upper leaves less dissected and 
with longer and narrower segments; inflorescence rather simple, racemose, leafy below; stam- 
inate heads subsessile; involucre saucer-shaped, strigose, and glandular-puberulent, 4-5 mm. 
broad; lobes 10-13, triangular; paleae of the receptacle with filiform bases and spatulate tips; 
corolla pubescent; pistillate heads in small clusters on the lower part of the raceme, in the 
axils of linear leaves, often toothed or lobed towards the base, 1-flowered; fruit 2~3 mm. long, 
