Flora of North America species comparison

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Euphrasia stricta

drug eyebright, euphraise dressée, stiff eyebright, strict eyebright, Tartary eyebright
Stems

branched, rarely simple, to 30 cm;

branches 1–5 pairs, from middle and distal cauline nodes;

cauline internode length 0.5–2 times subtending leaves.
Leaves

blade narrowly oblong to ovate-oblong, 2–9(–12) mm, margins serrate, teeth 1–3 pairs, apices subacute to aristate.
Inflorescences

beginning at node (5–)7–9(–11);

bracts green, sometimes purple adaxially, broader than leaves, oblong to ovate, length not more than 2 times width, 5–10 mm, surfaces glabrous or sparsely to densely hirsute and hairs eglandular, sometimes glandular-pubescent and hairs glandular, stalks 1- or 2-celled, 0.1–0.2 mm, teeth 4 or 5 pairs, longer than wide, apices acute, sometimes aristate.
Flowers

corolla white, usually suffused with lilac, 8–10 mm, abaxial lip exceeding adaxial.
Capsules

narrowly oblong, 4.5–6 mm, apex truncate to retuse.

Euphrasia stricta
Distribution
from FNA
IL; MA; ME; MI; MN; NH; NY; PA; RI; VT; WI; NB; NS; ON; PE; QC; Europe; Asia (w Siberia) [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 7 (2 in the flora).

Occurrence of Euphrasia stricta in Alberta is based on the report by G. C. D. Griffiths (2002); no specimen has been located. Griffiths listed E. arctica subsp. borealis as new for Alberta, but both morphological and habitat descriptions fit E. stricta more closely. If true, then this introduced species has crossed the continent; all earlier records are from eastern Canada and New England (S. R. Downie and J. McNeill 1988).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Bract surfaces glabrous or sparsely to densely hirsute, hairs eglandular.
var. stricta
1. Bract surfaces hairy, hairs glandular.
var. brevipila
Source FNA vol. 17, p. 496.
Parent taxa Orobanchaceae > Euphrasia
Sibling taxa
E. arctica, E. disjuncta, E. farlowii, E. frigida, E. hudsoniana, E. micrantha, E. mollis, E. nemorosa, E. oakesii, E. ostenfeldii, E. randii, E. salisburgensis, E. subarctica, E. suborbicularis, E. tetraquetra, E. vinacea, E. wettsteinii
Subordinate taxa
E. stricta var. brevipila, E. stricta var. stricta
Name authority J. P. Wolff ex J. F. Lehmann: Prim. Lin. Fl. Herbipol., 43. (1809)
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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