Euphrasia hudsoniana

Fernald & Wiegand

Rhodora 17: 194. 1915.

Common names: Hudson Bay eyebright
IllustratedEndemic
Treatment appears in FNA Volume 17. Treatment on page 498. Mentioned on page 493, 499.

Stems simple or branched, to 35 cm; branches 1–5 pairs, from distal cauline nodes; cauline internode lengths (1–) 2–5 times subtending leaves. Leaves: blade lanceolate to ovate, 5–12 (–16) mm, base strongly cuneate, margins serrate to incised-serrate, teeth 1–5 pairs, apices subacute to acute. Inflorescences beginning at node 2–9; proximal internode lengths 1–2.5 times bracts, distal shorter than bracts; bracts green, sometimes purplish adaxially, broader than leaves, elliptic to ovate, length not more than 2 times width, 7–15 (–20) mm, base strongly cuneate, surfaces moreorless hirsute and hairs eglandular, teeth 2–6 (or 7) pairs, as long as or longer than wide, apices acute, sometimes aristate. Flowers: corolla white, adaxial lip tinged lilac, 5–6.5 mm, lips moreorless equal. Capsules narrowly oblong, 4–7.5 mm, apex truncate to emarginate.


Phenology: Flowering summer.
Habitat: Gravelly, sandy, grassy, and rocky places, often calcareous, coastal or shores of streams and lakes.
Elevation: 0–200 m.

Distribution

Alta., Man., Nfld. and Labr. (Labr.), Ont., Que., Mich., Minn.

Discussion

Euphrasia hudsoniana has been reported from Alberta; the voucher specimen supporting that occurrence has not been verified by the author.

The status of var. contracta P. D. Sell & Yeo and var. ramosior P. D. Sell & Yeo is unclear. Some specimens identified as var. contracta represent precocious states of var. hudsoniana. Variety ramosior specimens look very different from typical var. hudsoniana, resembling the hybrid Euphrasia nemorosa x E. hudsoniana. But variation in their characters is consistent, particularly their minute corollas and type of pubescence, which is not typical of Euphrasia hybrids.

Selected References

None.

Lower Taxa

None.

"broader" is not a number.

... more about "Euphrasia hudsoniana"
0.5 cm5 mm <br />0.005 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
truncate +  and emarginate +
Aristate (?) +, Acute (?) +  and Subacute (?) +
Galina Gussarova +
Fernald & Wiegand +
cuneate +
1.2 cm12 mm <br />0.012 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
lanceolate;ovate +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
not leathery +  and fleshy +
alternate +  and subopposite +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
purplish;green +
elliptic +  and ovate +
1 +  and 5 +
tubular +  and flattened +
not accrescent +
0.4 cm4 mm <br />0.004 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
(1-)2-5 times subtending leaves +
Hudson Bay eyebright +
Alta. +, Man. +, Nfld. and Labr. (Labr.) +, Ont. +, Que. +, Mich. +  and Minn. +
0–200 m. +
2 +  and 1 +
indehiscent +, septicidal +, loculicidal +  and dehiscence +
Gravelly, sandy, grassy, and rocky places, often calcareous, coastal or shores of streams and lakes. +
axillary +  and terminal +
deciduous +
triangular +
short-ciliate +  and glabrous +
incised +, dentate +  and crenate +
serrate to incised-serrate +
tenuinucellate +  and unitegmic +
campylotropous-like +
Flowering summer. +
1-2.5 times bracts +
10 +  and 18 +
fusiform +
Illustrated +  and Endemic +
subequal +
branched +  and simple +
aerial +  and subterranean +
0 cm0 mm <br />0 m <br /> (35 cm350 mm <br />0.35 m <br />) +
not fleshy +
Euphrasia hudsoniana +
Euphrasia +
species +
longer than wide +
2 +  and 6 +