84 PROCEEDINGS OF THE AMERICAN ACADEMY. 
§ 4. Hereropectis, Gray. Low diffuse puberulent plants with setif- 
erous leaves: rays bright yellow: pappus of corneous subulate divergent 
retrorsely barbed awns (or reduced in the disk to a mere crown of rigid 
squamelle). — Pl. Wright. i. 83. Pectis § Pectidium, Gray, Proc. Am. 
Acad. xix. 48, in part. 
* Leaves thick, serrulate, the teeth and the tip continued into long sete. 
a P. multiseta, Benth. Annual, stouter than the related species, 
3 dm. or less high: leaves with slightly revolute margins, lanceolate, 1 to 
21 cm. long, the lower surfaces covered with scattered large glands and 
smaller punctate dots: peduncles becoming 3 cm. long: involucre 4} mm. 
high, 20-25-flowered, of 5 obovate-cuneate punctate and ciliate bracts: 
rays 6 mm. long: awns unequal in length (2 mm. or less), in the ray- 
flowers 3, in the disk-flowers 1 or 2, or the pappus reduced to a mere 
crown of more or less connate squamelle: akenes 3 or 4 mm. long, pu- 
bescent with long somewhat capitate hairs. — Bot. Sulph. 20. — Lower 
Cavirornia, Cape St. Lucas (Hinds fide Bentham, |. c. Xantus). 
* * Leaves thinner, setiferous only below the middle. 
De P. Coulteri, Harv. & Gray. Annual or perennial (?), slender, very 
“ diffuse and branched, 2 dm. or less in height: leaves narrowly linear, 
usually with revolute margins, 3 cm. or less in length, generally with 2 
rows of glands on the lower surfaces ; sete restricted to the subpinnatifid _ 
basal half of the leaf: peduncles varying in length from 3 or 4 mm. 1 
3} cm. ; involucre cylindraceous, 12-20-flowered, 5 to 7} mm. high, of 5 
(or by exception 6) linear-oblong often glandular-dotted ciliate bracts: 
rays 5 to 7 mm. long: awns somewhat unequal in length, in the rays 
3 to 6, in the disk 2 to 5 (generally 3 or 4), about 1} mm. long: akenes 
slender, 4 or 5 mm. long, strigose-pubescent with capitate hairs. — Harv. 
& Gray in Gray, Pl. Fendl. 62; Watson, Proc. Am. Acad. xxiv. 8. 
On sandy plains, Arizona to the Sonora coast, “ California,” i. e- prob- 
ably on the Gila River + (Coulter, no. 330); Arizona (Palmer), Sonor 
Alta (Coulter, no. 441 fide Hemsley); Sonora, Guaymas (Palme, 
1887, nos. 143, 654, 1890, no. 759). Dr. Palmer’s Sonora specimen 
are much more vigorous throughout than the earlier-collected specimens 
from the Arizona desert region, but, except in size, the plants seem to be 
the same. 
P. ambigua. Annual, similar in habit to P. Coulteri, but salle 
1 dm. or less in height : leaves thin, entire, linear or spatulate-linear, flat, : 
. a ae cea 
1 Coville, Bot. Gaz. xx. 528. 
