Flora of North America species comparison

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Lomatogonium rotatum

Lomatogonium rotatum var. rotatum

lomatogone rotacé, marsh-felwort, star gentian
Photo is of parent taxon
Habit Herbs 3–50(–60) cm. Herbs 3–25(–45) cm.
Stems

usually dark purplish to reddish brown;

branches, if any, and pedicels moderately ascending.
Leaves

proximal blades spatulate to elliptic-oblanceolate, middle and distal blades narrowly ovate to lanceolate or linear, 4–40 × 1–10 mm, apex obtuse to acuminate.

basal usually persistent, blades spatulate to elliptic-oblanceolate, 1–2 cm × 2–5 mm, apex obtuse;

cauline blades narrowly ovate to narrowly lanceolate, 1–3.8 cm × 1.5–6(–10) mm, apex obtuse to acute.
Flowers

calyx 5–15 mm, lobes linear, apex acute or acuminate;

corolla white to blue with darker veins, widely campanulate to subrotate, 5–20 mm, lobes elliptic-ovate, apex acute to apiculate, margins of nectaries forming a deeply fringed tube, 0.6–1.2 mm;

stigmas strongly decurrent on the sutures of the ovary.

calyx lobes acute;

corollas pale to medium violet-blue, rarely whitish.

Lomatogonium rotatum

Lomatogonium rotatum var. rotatum
Phenology Flowering summer.
Habitat Wet seaside meadows, occa­sionally around salt springs, consistently near coast in the flora area, estuarine marshes, rock crevices at high-tide mark, moist sand or silt substrate in tidal estuaries.
Elevation 0–20 m. (0–100 ft.)
Distribution
from USDA
North America; Eurasia
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; ME; MB; NB; NL; NT; NU; ON; QC; YT; Greenland; Eurasia
Discussion

Varieties 3 (2 in the flora).

The report of 2n = 10 for Lomatogonium rotatum from the Manitoba shore of Hudson Bay by Á. Löve and D. Löve (1982b) is in accord with their earlier reports for this species in Iceland (Löve and Löve 1956; D. Löve 1953). More recently, however, 2n = 16 has been reported for L. rotatum in Iceland by Löve and Löve (1986) and in China by Yuan Y. M. and P. Küpfer (1993). No counts have been reported for var. fontanum. Reports of 2n = 10 for this species in any part of its range should be considered questionable.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Branches, if any, and pedicels moderately ascend­ing; basal leaves usually persistent, basal blades spatulate to elliptic-oblanceolate, cauline blades narrowly ovate to narrowly lanceolate, 1–3.8 cm × 1.5–6(–10) mm; corollas usually blue, rarely whitish.
var. rotatum
1. Branches and pedicels appressed-ascending; basal leaves usually absent at flowering, cauline blades narrowly lanceolate to linear, 1.5–4 cm × 0.7–3(–4) mm; corollas white, often suffused with pale blue, or pale blue throughout.
var. fontanum
Source FNA vol. 14. FNA vol. 14.
Parent taxa Gentianaceae > Lomatogonium Gentianaceae > Lomatogonium > Lomatogonium rotatum
Sibling taxa
L. rotatum var. fontanum
Subordinate taxa
L. rotatum var. fontanum, L. rotatum var. rotatum
Synonyms Swertia rotata, Pleurogyne rotata
Name authority (Linnaeus) Fries: Summa Veg. Scand., 554. (1849) unknown
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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