158 COMPOSITAE 
29. LAYIA a & Arn. Bot. Beechey 148. 1833, nomen 1 DG. 
rod. 7: 294. 1838, nomen conservandum 
Vernal annuals with chiefly aaa ae ee or toothed to pinnatifid, narrow 
leaves. Heads many-flavored, on usually ed terminal peduncles, hetero S 
f 15 species, all of hich occur in, and 13 of which are restricted to, California. Type species, 
Tridax 0) "pilantiolins Hook. & Arn 
Bracts of receptacle subtending each disk-flower; involucre (and herbage) not glandular, the phyllaries with promi- 
nent p ee cr8y processes at base of hairs. 
Pappus ote subulate awns; disk- ni a asocely: org sip cuneate; shgllesieg hispid-ciliate or pec- 
ti wi ioe the folded edge, otherwise nearly ; Coast Ranges . L. chrysanthemoides. 
Raney of Boing tg thin paleae; disk- RCE, enna clavate; shots uniformly pepaiate: hispid 
reat 
Bracts of harsagate’ — toa dy g between ray- and disk-flowers; involucre (and er pt om the 
phyllaries pubescent but not a ps ve. 
— paleaceos, slabrons sheet for capillary hairs radiating from very base 
y-flow in 1 series, their ligules obovate to flabelliform, tein chines dull, glabrous or pubesc 
dntiesed at — ventrally; involucre hemispheric, green, the bracts not inflated, with etn 
tips; pappus 2-3.5 mm. long. 
Ligules white; ps vaio ray-achenes sericeous; leaves mostly entire. 3. L. leucopappa. 
ae Sarma with long white tips; anthers black; ray-achenes 2 gals or lightly sueeerent toward 
ea m lobed. Ree Sag 
Ray see ok in 2 series, their ligules oblong-spatulate, their achenes polished, pleas plump; 
—— broadly ur rceolate, ee Slotted, the bracts inflated, with inconspicuous ti ipsi pappus 1-2 
mm. long 34 . fone. 
Pappus setaceous or if palaceous, plumose 
Ligule sited with white tip avely yellow throughout) ; pappus commonly merely scabrid, if plumose, 
Fs o with inner wool, of 18-30 bristles; anthers black; tips of puiinrieg. longer tha than a basal portion. 
Ligule Bas od or white (none in L. discoidea) but not as above (except sometimes in ra “paillardioides) : . 
ppus plumose, with inner woolly hairs only in L, septontrionalis and L. glandulosa; tips of phyl- 
tare: pk than the basal portion (except in L. heterotricha 
Pappus persistent; “ssigg not prominently fistulous, pubescent Kalan (glabrate in L. carnosa); disk- 
rigos 
achenes stri 
Ligules more >i 5 mm. “ed conspicuous (none in L. discoidea) ; self-sterile. 
Anthers yellow; involucre not urceolate; stems not dark-dott ed: p pappus _— 
Involucre ovoid, 42 mm. high; ligules golden-yellow; disk-coro 
—8 mm. lon 
ray-achenes 3.8-5.2 mm. lo ong; pappus 3.5— ru 2 mm. sy ie ‘slender Ritoeies 
6-21, densely plumose, with inner wool; Lake and wea =: ounties. 
. L. septentr 
Involucre turbinate or campanulate to hemispheric, 5-9.5 mm. high; oe sham se 3-6 
ong. 
Heads discoid; pappus paleaceous, 1-1.5 mm. long, ae ay San Benito County. 
. L. discoidea. 
Heads inane pappus setaceous, 2-5 mm. long, white. 
Stems hispid; basal — — or lobed, the cauline entire; ray-achenes 
3-4 mm. long; 3-5 mm. long, the bristles 10(— 12), flattened, 
lin: ceeatercess, icant plumose, usually with i Poca: 2id wool, 
may 38 glandulosa. 
Stems pilose or ce tong basal leaves pinnatifid to oe tifid; ray-achenes 
2.5-4 mm. long; pappus 2—4 mm. long, a — S pied (rarely cons, 
filiform, Seger plumose, without wool. 
Anthers black; involucre urceolate; stems dark-dotted; pappus ores 
11. L. gaillardioides. 
Ligules 2-4 mm. long, inconspicuous; self-fertile; pappus rufous to whitish; anthers black. 
Ligules yellow; pappus-bristles 11-15; stem rigidly erect, 20-100 cm. tall, dark-dotted; 
ntly odorous; ray-flowers 8-16. 
wer leaves laciniate-dentate, broadly oblanceolate or oblong; —- mostly stout; 
San Francisco Bay to Santa Cruz 12. L. hieracioides. 
Lower leaves pinnatifid, if merely déstate ee ty narrower; stems mostly 
slender; Mount Diablo to Santa Barbara 3. L. pan piclata 
Ligules white; Based scale ad fli fon — rel ip sony Sinaehed. to 7 as aah gone without dots; not 
Pappus deciduous; oe fistulous, erent: below; POO es sericeous; teas creamy 
white to pale alien 15. L. heterotricha. 
1. Layia chrysanthemoides (DC.) A. Gray. Smooth Layia. Fig. 5237. 
Oxyura ssioanrsinaioe, 8 -. — 5: 693. 1836. 
Hartmannia ciliata DC. op. ci 
Callighicte doviglan Sat tare: Bot. Beechey Suppl. 356. 1838. 
