Gentianella quinquefolia
Gentianella quinquefolia subsp. occidentalis
ague-weed, stiff dwarf-gentian, stiff gentian
agueweed
erect, usually branched distally but without long branches near base.
basal usually withered by flowering, blades spatulate to oblanceolate, 5–35 × 2–12 mm;
cauline blades ovate, 5–60(–80) × 2–35(–45) mm.
terminal and often axillary, dichasial or partly umbelloid cymes;
pedicels 1–17 mm.
5-merous;
calyx 2–15 mm, lobes subulate to lanceolate or linear-oblong, usually subequal, (1–)2–8(–10) mm;
corolla violet, violet-blue, blue, or occasionally pale yellow or white, narrowly funnelform, opening narrowly, 10–25 mm, lobes incurved, ovate-triangular, 3–8 mm, apex short-attenuate, without adaxial scales or fringes;
ovary stipitate.
calyx 5–15 mm, lobes linear-oblong to lanceolate or occasionally subfoliaceous, 3–8(–10) mm;
corolla (15–)18–25 mm, lobes 4–8 mm.
= 36.
Gentianella quinquefolia
Gentianella quinquefolia subsp. occidentalis
Subspecies 2 (2 in the flora).
The differences between the subspecies of Gentianella quinquefolia often have been overstated. Although the subspecies are largely separated geographically, plants intermediate in morphology are common throughout much of the range of the species. To some degree, the extremes probably represent phenotypic responses to local environmental conditions.
According to C. T. Mason and H. H. Iltis (1966) Gentianella quinquefolia is at least sometimes a biennial in Wisconsin, whereas elsewhere it has been reported to be an annual. Of the many flowers often present on a single plant, only a few may have open corollas at any one time.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Calyces 2–6(–8) mm, lobes subulate to linear-oblong, 1–4(–6) mm; corollas 10–23 mm. | subsp. quinquefolia |
1. Calyces 5–15 mm, lobes linear-oblong to lanceolate or occasionally subfoliaceous, 3–8(–10) mm; corollas (15–)18–25 mm. | subsp. occidentalis |
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