80 PROCEEDINGS OF THE AMERICAN ACADEMY. 
San Diego Co. (Palmer, 1875, no. 200), El Rio (Lemmon, no. 78); 
Sonora, Valley of the Cocospera (Schott), Guaymas (Palmer, 1887, 
no. 655); Lower Catirornia, San Gregorio (Brandegee). Said to 
be lemon-scented. 
a P. Palmeri, Watson. A little stouter than the last: leaves mostly 
“broader and thinner, about 4 cm. long, 2 to 4 mm. wide, with 1 or 2 
short basal sete: peduncles thicker, longer, scattered, 8 to 8 cm. long, 
3—8-bracteate: involucre 5 to 6 mm. high, 35-50-flowered; the bracts 
plane, keeled below the middle: disk-pappus as in the last or merely 
scabrous; ray-pappus of 2 or 3 slender ariste 3 mm. long, somewhat 
dilated at bases: akenes 4 mm. long, strigose with clavellate, not uncinate 
or capitate, hairs..-— Proc. Am. Acad. xxiv. 58; Rose, Contrib. U. S. Nat. 
Herb. i. 338. — On foothills and in rich soil along streams, Sonora and 
Lower California. Sonora, Guaymas (Palmer, 1887, nos. 652, 653), 
Agiabampo (Palmer, 1890, no. 765); Lowrr CaLirorniA, Purissima, 
1889 (Brandegee), La Paz (Palmer, 1890, no. 115). The Lower Cali- 
fornian plants are smaller and with fewer-flowered heads than the original 
Sonora specimens, but otherwise they are the same. 
+ + Perennials or rarely annuals, the pappus merely scabrous. 
P. stenophylla, Gray. Very diffusely branching from a suffrut- 
cose base, the branches purplish, slender, glabrous, 2 or 3 dm. long‘ 
leaves narrowly linear, mucronate, 3 or 4 cm. long, 2 mm. wide, or ge" 
erally strongly revolute and scarcely 1 mm. wide, bearing two rows of 
marginal glands and 2 or 3 pairs of long slender basal setx: heads scat- 
tered toward the tips of the branches; the filiform 4—6-bracteate — 
cles becoming 5 or 6 cm. long: involucre 5 mm. high, 15-18-flowered ; 
the 8 narrowly oblong bluntish bracts plane above, slightly keeled below 
the middle: rays yellow, narrow: disk-pappus of 20 to 40 unequal we : 
wardly scabrous capillary bristles 2 mm. or less in length; ray-pappus 
slender smooth or minutely scabridulous awns 14 mm. long, slightly 
dilated below: akenes 2} to 3 mm. long, sparingly pubescent with short 
clavellate hairs. — Proc. Am. Acad. xxi. 393. — Hillsides and dry soil 
Northern Mexico. Curmvanva, Batopilas (Palmer, 1885, no. ig 
Sonora, Arroyo Hondo (Hartman, no. 216, in part), Badehuachi (F. & 4 
Lloyd, no. 402). Said to be aromatic. i 
7 P. Heenkeana, Schz. Bip. Perennial from a suffruticose ee | 
annual, the stems puberulous or pubescent, ascending or somewhat a 
pressed, the longest 2 dm. in length: leaves pale green, linear or spatur 
late-linear, mucronate, 1 to 2} cm. long, 1} to 4 mm. wide, smooth oF 
ee 
