266 COMPOSITAE 
2. Heterotheca subaxillaris (Lam.) Britt. & Rusby. Camphor Weed. Fig. 5439. 
Inula eras aed rages Encycl. Meth. 3: 259. 1789. 
Inula scabra Pursh, Fl. Amer, Se Ene 2: 531. 
Chrysopsis si posh t. Gen, 2: 1818. 
Heterotheca lamarckii Cass. “AS sing Nat. 212-331. 123), 
Heterotheca scabra DC. Prod. 5: 317. 1836. 
Heterotheca subazillaris Britt. & Rusby, Trans, N.Y. Acad. 7: 10. 1887. 
Annual or biennial, the eae pane ge stem simple below or openly branching, ee sit me 
hispid-hirsute, glandular above. rather coa orb eto glandular, ov aoe to lance-oblon 
serrate-dentate or subentire, the lower spetiolate, the r subcordate- clasp Heiay relatively 
small, numerous; involucre 6- 8 m igh, g eadelee and: somewhat canescent; ’ ray-florets about 
20-28 ; ganar 40-60 : pappus fa sy the r serie. ‘sually conspicu 
Sandy des and ditches, Sonoran Page easternmost Mojave Desert in eof: intepenert at 
San Gabriel, Cotitonins common eastward to Florida and Delaware. Type locality: Carolina. "Aug.— —Oct 
74. CHAETOPAPPA* DC. Prod. 5: 301. 1836. 
Ours low, very slender annuals with simple or diffusely branched stems and alternate, 
entire, chiefly linear leaves. Heads small, few- to many-flowered, terminating very slender 
peduncles, radiate, disciform, or discoid all flowers potentially fertile, yellow, white, or 
eddish ‘volu 
cent. Pappus of 3 to many fragile slender bristles, sometimes dilated and more or less 
joined at very base, or wanting. [Name Greek, meaning bristle-pappus. ] 
A genus of about 15 species of the southwestern United States and Mexico. Type species, Chaetanthera 
asteroides Nutt 
Ray-fl Pp t, conspicuous; involucre broadly hemispheric. 
Ligul Id llow ; southern California 
jipenkeese pubéscent. 1. C. lyonii. 
Involucre glabrous. 
Phyllaries in strongly satis alg scsi to the short-caudate tip. 2. 
hyllaries in subequal se obtuse, nulat ess itis. 
Ligules white ed ne — naeee Franc npg ae region. 4. C. bellidiflora. 
Ray-fl sent; involucre tu 
rbin: 
Stem simple or with few tet ‘iancien: disk-corollas ind at throat, contracted at sola oc -. 
ext 
Stem diffusely branched; disk-corollas narrowly linear. iC. ak 
1. Chaetopappa spe (A. Gray) Keck. Lyon’s Chaetopappa. Fig. 5440. 
Pentachaeta lyonii A. Gray, Syn. Fl. N. Amer. 12: 445. 1884. 
Chaetopappa lyonti Keck, yesh ei 958. 
Stem 1-5 dm 
linear or Stl ne it ce aoe . long ; involucre about m. high, the ptr pares: mpbesa:. 
lance-linear, acuminate, n zane scarious-margined ; fay Mo ioe abou 0; -flowers about 
00 ; achenes of ray tor disk similar, d rown, oicaty one with short hairs; ; paps 
of 10-12 ve ery fragile, filiform bristles, flared at ver y base and forming a rudimentary c 
In clayey soil of grassland areas, Upper Sonoran Zone; coastal.part of Los Angeles County, Rovio’ and 
Santa Catalina Island, o cases. ppd Type locality: San Pedro, near Palos Verdes Mountain. March-April. 
2. Chaetopappa atirea (Nutt.) Keck. Golden Chaetopappa. Fig. 5441. 
nceeareeigicra aurea ns Trans. Amer. Phil. Soc. II. 7: 336. 1840. 
eck, Aliso 4: 102. 
Usual y — branched, 8-30 cm. high, entirely gatey, or the leaf-margins paul ciliate. 
Leaves > ar linear, the lower 1-3.5 cm. lon o 2mm. wide, the upper m me pies 
hi i 
obtuse a 1, 
ean a ually 10-40, the ligule 5-12 mm. long ; disk-flowers usually —— achenes 
abdist on m. long, sparsely and finely short-strigose ; pappus of 5(-7) scabrous 
filiform i rm bristles + Anse diickened toward apex, flared at very base and often face about equaling 
the c 
Dy open ound and grassy ar oe up to 5,000 feet, mostly wha Sonoran Zone; cismontane southern Cali- 
fornia from pices anantes County to Diego, San Diego County ype locality: San Diego. April—July. 
* Text contributed by David Daniels Keck. 
