1.
Grindelia ciliata
(Nuttall) Sprengel, Syst. Veg. 3: 575. 1826.
Donia ciliata
Nuttall, J. Acad. Nat. Sci. Philadelphia 2: 118. 1821;
Grindelia papposa
G. L. Nesom & Y. B. Suh;
Haplopappus ciliatus
(Nuttall) de Candolle;
Prionopsis ciliata
(Nuttall) Nuttall
Annuals or biennials,
20—150+ cm.
Stems
erect, stramineous, glabrous (branched distally).
Cauline leaf blades
oblong to obovate, 30—50(—80) mm, lengths mostly 2—4 times widths, bases ± clasping, margins dentate (teeth apiculate to setose), apices rounded, faces glabrous, obscurely, if at all, gland-dotted.
Heads
borne singly or in open to crowded, corymbiform arrays.
Involucres
broadly urceolate, 10—15 × 15—25 mm.
Phyllaries
in 3—5 series, spreading to appressed, subulate to linear-lanceolate, apices recurved to straight, attenuate, slightly to moderately resinous.
Ray florets
25—45; laminae 10—15+ mm.
Cypselae
whitish to grayish, 2—4 mm, apices smooth or minutely coronate, faces smooth or striate;
pappi
(persistent or tardily falling) of 25—40 barbellate bristles 3—7+ mm subtending 8—15+ barbellate, setiform awns or subulate scales 7—10 mm (the longer surpassing disc corollas).
2
n
= 12.
Flowering Aug—Oct. Disturbed sites, prairies, railroads, roadsides; 100—1500 m; Ariz., Ark., Calif., Colo., Ill., Iowa, Kans., La., Mich., Mo., Nebr., N.Mex., Okla., Tex.
