16.
Grindelia lanceolata
Nuttall, J. Acad. Nat. Sci. Philadelphia. 7: 73. 1834.
Grindelia lanceolata
var.
texana
(Scheele) Shinners;
G. littoralis
Steyermark;
G. texana
Scheele
Biennials or perennials
(perhaps flowering first year), 30—150 cm.
Stems
erect, whitish, stramineous, or reddish, usually glabrous, rarely sparsely pilose near bases.
Cauline leaf blades
triangular, ovate, or oblong to lanceolate or linear, 25—60(—110) mm, lengths 3—12 times widths, bases cuneate or ± clasping, margins usually serrate to dentate (teeth apiculate to setose), rarely entire, apices acute to acuminate, faces usually glabrous (or, near margins, scabridulous, rarely puberulous) and usually not, rarely notably, gland-dotted.
Heads
usually in corymbiform arrays, rarely borne singly.
Involucres
broadly urceolate to globose, 8—15 × 10—20+ mm.
Phyllaries
in 5—6(—9) series, weakly spreading to appressed, filiform to linear or lanceolate, apices slightly recurved or straight to incurved, terete, slightly to moderately resinous.
Ray florets
12—36; laminae 10—16 mm.
Cypselae
stramineous to grayish, 2—6 mm, apices coronate or knobby, faces smooth or striate;
pappi
of 2 straight, smooth (apices often dilated), setiform awns 4—8 mm, usually equaling to slightly surpassing disc corollas.
2
n
= 12.
Flowering Jun—Oct. Limestone glades and rocky prairies, calcareous beach deposits; 0—700 m; Ala., Ark., Conn., Kans., Ky., La., Miss., Mo., Ohio, Okla., Tenn., Tex., Va., Wis.
Reports of
Grindelia lanceolata
from Connecticut, Mississippi, Ohio, Virginia, and Wisconsin are probably based on introductions. Plants of
G. lanceolata
from Oklahoma and Texas with cauline leaf blades mostly ovate to oblong (versus mostly lanceolate to linear) and outer phyllaries shorter than (versus ± equaling) the inner have been called var.
texana
or
G. texana
. Plants from coastal Texas called
G. littoralis
have densely gland-dotted leaves.
