9.
Layia glandulosa
(Hooker) Hooker & Arnott, Bot. Beechey Voy. 358. 1839.
Blepharipappus glandulosa
Hooker, Fl. Bor.-Amer. 1: 316. 1833;
Layia glandulosa
subsp.
lutea
D. D. Keck;
L. glandulosa
var.
lutea
(D. D. Keck) Hoover
Plants
3—60 cm (self-incompat-ible); glandular, often not strongly scented, sometimes spice-scented.
Stems
not purple-streaked (often uniformly dark purple).
Leaf blades
obovate to linear, 6—100 mm, margins (basal leaves) toothed to lobed.
Involucres
± campanulate to hemispheric, 4—11 × 3—11+ mm.
Phyllaries
3—14, apices often shorter (sometimes longer) than folded bases.
Paleae
in 1 series between ray and disc florets.
Ray florets
3—14; laminae often white, sometimes yellow or pale yellow, 3—22 mm.
Disc florets
17—100+; corollas 3.5—6.5 mm; anthers yellow to brownish.
Ray cypselae
glabrous.
Disc pappi
of 10—15 usually white (rarely tawny), linear-attenuate to subulate, ± equal scales 2—5 mm, each proximally plumose and often adaxially woolly.
2
n
= 16.
Flowering Feb—Jul. Openings in scrub, woodlands, forests, grasslands, and meadows, gravelly or sandy soils, sometimes dunes; 0—2700 m; Ariz., Calif., Idaho, N.Mex., Oreg., Utah, Wash.; Mexico (Baja California).
Layia glandulosa
occurs in deserts of western North America, extending to the Pacific coast in central and southern California. As treated here (provisionally) and previously,
L. glandulosa
corresponds to a paraphyletic group; molecular phylogenetic data have indicated that
L. discoidea
is most closely related to a subset of lineages in
L. glandulosa
, including yellow-rayed populations previously recognized as subsp.
lutea
or var.
lutea
(B. G. Baldwin, unpubl.). Report of
L. glandulosa
from British Columbia has not been confirmed.
