Euphrasia arctica

Lange ex Rostrup

Bot. Tidsskr. 4: 47. 1870.

Common names: Arctic eyebright
Treatment appears in FNA Volume 17. Treatment on page 495. Mentioned on page 493.

Stems simple or branched, to 25 (–35) cm; branches 1–5 (or 6) pairs, from proximal, middle, or distal cauline nodes; cauline internode lengths 2–4 times subtending leaves. Leaves: blade usually broadly ovate, 3–16 mm, margins serrate, teeth 1–6 pairs, apices acute. Inflorescences beginning at node 3–5; bracts green or purplish adaxially, broader than leaves, broadly ovate or deltate, length not more than 2 times width, (4–) 5–9 (–11) mm, surfaces glabrous or setose and hairs eglandular, sometimes pubescent and hairs glandular, stalks 1-celled or 2-celled, 0.1–0.2 mm, teeth 3–6 pairs, as long as or much longer than wide, apices acute to acuminate. Flowers: corolla white, sometimes lilac, adaxial lip lilac, 6–11 (–13) mm, abaxial lip exceeding adaxial. Capsules oblong to elliptic or obovate, 4.5–8 mm, apex truncate to retuse.

Distribution

B.C., N.B., N.S., Nfld. and Labr. (Nfld.), Ont., P.E.I., Que., Maine, Europe, Atlantic Islands (Iceland)

Discussion

Subspecies 5 (2 in the flora).

The other three subspecies of Euphrasia arctica occur in Europe (P. F. Yeo 1978).

Selected References

None.

Key

1 Stem bases flexuous or decumbent; branches 1 or 2(–5) pairs, usually flexuous; bract surfaces glabrous or hairy, hairs eglandular bristles, teeth not much longer than wide; corollas 7–11(–13) mm. Euphrasia arctica subsp. arctica
1 Stem bases erect; branches 1–5(or 6) pairs, usually straight; bract surfaces hairy, hairs glandular and eglandular bristles, teeth much longer than wide; corollas 6–8(–10) mm. Euphrasia arctica subsp. borealis

"broader" is not a number.

... more about "Euphrasia arctica"
1.1 cm11 mm <br />0.011 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
Truncate (?) +  and Retuse (?) +
Galina Gussarova +
Lange ex Rostrup +
0.3 cm3 mm <br />0.003 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
not leathery +  and fleshy +
alternate +  and subopposite +
0.9 cm9 mm <br />0.009 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
purplish;green +
deltate +  and ovate +
1 +  and 5 +
tubular +  and flattened +
not accrescent +
oblong;elliptic or obovate +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
2-4 times subtending leaves +
Arctic eyebright +
lilac +  and white +
B.C. +, N.B. +, N.S. +, Nfld. and Labr. (Nfld.) +, Ont. +, P.E.I. +, Que. +, Maine +, Europe +  and Atlantic Islands (Iceland) +
2 +  and 1 +
indehiscent +, septicidal +, loculicidal +  and dehiscence +
axillary +  and terminal +
deciduous +
triangular +
short-ciliate +  and glabrous +
incised +, dentate +  and crenate +
tenuinucellate +  and unitegmic +
campylotropous-like +
Bot. Tidsskr. +
10 +  and 18 +
fusiform +
2-celled +  and 1-celled +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
subequal +
branched +  and simple +
aerial +  and subterranean +
0 cm0 mm <br />0 m <br /> (25 cm250 mm <br />0.25 m <br />) +
not fleshy +
setose;glabrous +
Euphrasia arctica +
Euphrasia +
species +
much longer than wide +
3 +  and 6 +