Gentiana puberulenta
Gentiana decora
downy gentian, prairie gentian
Appalachian gentian, mountain gentian, showy gentian
1–5(–20), terminal from caudex, erect or nearly so.
1–4, terminal from caudex, decumbent to erect.
cauline, ± evenly spaced;
blade narrowly oblong-lanceolate, 1.5–7 cm × 4–18 mm, apex obtuse to acute.
cauline, ± evenly spaced or somewhat more widely spaced distally;
distal blades lance-elliptic to ovate-elliptic, 3–10 cm × 7–40 mm, apex acute to acuminate;
proximal blades oblanceolate to obovate, apex obtuse to acute.
1–6-flowered dense cymes or heads, sometimes with additional flowers at 1–3 nodes or on short branches.
± dense 1–15-flowered cymes or heads, sometimes with additional flowers at 1–3 nodes or on short branches.
calyx 11–36 mm, lobes linear, 4–18(–25) mm, margins ciliate;
corolla deep blue or rarely rose-violet, narrowly campanulate, open, (30–)35–60 mm, lobes spreading or ± recurved, ovate, 6–15 mm, free portions of plicae divided less than 1/2 their length into 2 ± triangular, lacerate segments;
anthers distinct.
calyx 10–20 mm, lobes ± erect, subulate to linear or occasionally oblanceolate, 2–8(–12) mm, margins ciliate;
corolla white to pale or occasionally medium blue or violet, tubular, loosely closed to fully but narrowly open, 25–45 mm, lobes ovate-triangular, 3–6 mm, longer than plicae, free portions of plicae divided 1/2 or more of their length into 2 unequal, ± triangular, lacerate segments, narrower segment usuallly deflexed;
anthers connate.
winged.
winged.
= 26.
= 26.
Gentiana puberulenta
Gentiana decora
Gentiana puberulenta is evidently extirpated from Ontario, Louisiana, Maryland, and New York, where outlying prairie communities have largely been eliminated by agricultural and urban expansion.
The name Gentiana puberula Michaux 1803, not Franchet 1890, and the homotypic synonym Dasystephana puberula (Michaux) Small have long and often been misapplied to this species but are typified by a specimen of G. saponaria.
Some small plants of Gentiana puberulenta appear similar to G. affinis var. affinis, but only a few specimens appear actually to be hybrids between these species. Where their ranges approach each other, the flowers of G. affinis are generally much smaller than those of G. puberulenta, and the corolla lobes of G. affinis are generally less than twice as long as the free portions of the plicae, whereas those of G. puberulenta are more than twice as long. The flower size of G. affinis var. ovata more closely approaches that of G. puberulenta, but in that variety, the range of which does not overlap that of G. puberulenta, the leaves are usually ovate to elliptic rather than narrowly oblong-lanceolate, and the distal internodes are often about as long as or longer than the leaves, in contrast to the proportionately shorter internodes of G. puberulenta. For further guidance in distinguishing between G. puberulenta and G. affinis, see discussion under 13. G. affinis.
Hybrids of Gentiana puberulenta with the strikingly dissimilar G. andrewsii, constituting G. × billingtonii Farwell (as species), and with G. flavida, constituting G. × curtisii J. S. Pringle, occur in the tall-grass prairies. Hybrids with G. saponaria formerly occurred in western Maryland.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Hybrids of Gentiana decora with G. austromontana, G. clausa, and G. saponaria are known.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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