Liatris laevigata
Liatris lancifolia
clusterleaf gayfeather, shortleaf blazing star
Great Plains gayfeather, lanceleaf blazing star
glabrous.
glabrous.
basal and proximal cauline (mostly arising from congested nodes) 1-nerved, lance-linear to linear, 100–380 × (1–)2–6(–9) mm, abruptly reduced distally, glabrous (minutely white-dotted by stomates), weakly, if at all, gland-dotted (glandular hairs usually not evident).
basal and lower cauline 3–5-nerved, narrowly oblong-lanceolate to narrowly spatulate-oblanceolate, 60–180(–330) × 6–12(–15) mm (usually becoming more densely arranged distally), abruptly reduced near midstem (continuing densely to immediately proximal to heads), essentially glabrous, gland-dotted (bases of basal often fibrous-persistent).
(ascending) 1–7 mm.
0.
turbinate-campanulate, 5–7 × 4–5 mm.
turbinate-cylindric to turbinate-campanulate, 7–9 × 4–7 mm.
3–5;
corolla tubes glabrous inside.
5–8(–12);
corolla tubes glabrous inside.
in 2–3(–4) series, lanceolate to oblong or elliptic-oblong, unequal, essentially glabrous, margins with hyaline borders, apices usually rounded-retuse and minutely involute-cuspidate to apiculate.
in 3–4 series, ovate to oblong, unequal, glabrous, margins with hyaline borders, sometimes ciliolate, apices rounded to obtuse.
in compact, racemiform arrays.
in dense, spiciform arrays.
2.5–4 mm;
pappi: lengths ± equaling corollas, bristles barbellate.
4–4.5 mm;
pappi: lengths ± equaling corollas, bristles barbellate.
globose.
globose.
= 20.
Liatris laevigata
Liatris lancifolia
R. P. Wunderlin (1998) treated Liatris laevigata and L. tenuifolia as varieties in one species; A. Cronquist (1980, p. 207) also treated them within one species, as “two well-marked but wholly confluent geographic vars.” They have been noted to grow intermixed in Osceola County, Florida (L. laevigata, Ray et al. 10472, NCU; L. tenuifolia, Ray et al. 10423, NCU). Unequivocal intermediates have not been seen in the present study. With the observation of consistent morphologic differences in habit, vestiture, and leaf punctation, and their broad sympatry in Florida, it seems appropriate to recognize them at specific rank.
Liatris laevigata is restricted to peninsular Florida and immediately adjacent Georgia (e.g., Floyd’s Island, Charlton County, Cypert 240, SMU). Leaf width is markedly variable, and collections of narrow-leaved forms sometimes have been identified as L. tenuifolia. Narrow-leaved forms of L. laevigata apparently are more common in southern Florida (Collier, Dade, Glades, Lee, Monroe, Okeechobee, Palm Beach, and Polk counties). Broader-leaved plants apparently tend to have larger corms, which may be related to age or habitat.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
The abrupt size reduction of cauline leaves in Liatris lancifolia is similar to that of L. spicata var. resinosa; the long, dense spikes and wider basal leaves are more like those of L. spicata var. spicata. Little differentiation exists between L. lancifolia and L. spicata, but L. lancifolia is maintained here at specific rank, coordinate with L. spicata, primarily because of its wide geographic disjunction and generally different habitat. Recognition that the two elements within L. spicata have a nearly analogous relationship of range and habitat might provide rationale for treating all three of these closely similar taxa at equivalent rank. Liatris lancifolia is expected in Oklahoma.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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