Euphrasia disjuncta

Fernald & Wiegand

Rhodora 17: 190. 1915.

Common names: Polar eyebright euphraise à aires disjointes
Endemic
Synonyms: Euphrasia arctica var. disjuncta (Fernald & Wiegand) Cronquist
Treatment appears in FNA Volume 17. Treatment on page 495. Mentioned on page 492, 493, 494, 488, 564.

Stems simple or branched, to 25 cm; branches 1–6 pairs, erect, from middle and distal cauline nodes; cauline internode lengths (2.5–) 3–5 times subtending leaves. Leaves: blade broadly ovate, suborbiculate, or oval, 3–9 (–11.5) mm, margins crenate to crenate-serrate, teeth 1–4 (or 5), apices subacute to acute. Inflorescences sparsely spicate, not 4-angled, beginning at node 3–8; proximal internode lengths 1–3 times bracts; bracts purplish adaxially, broader than leaves, ovate to obovate, length not more than 2 times width, 5–8 mm, base cuneate, surfaces hirsute and hairs eglandular or pubescent and hairs glandular, stalks sometimes flexuous, 3–6-celled, 0.2–0.6 mm, teeth (2 or) 3 or 4 (or 5) pairs, longer than wide, apices acute, sinuses between teeth acute. Flowers: calyx lobes straight, apex acute; corolla white, 4–5.5 mm, lips moreorless equal. Capsules oblong to elliptic, 4–5 mm, apex truncate to retuse.


Phenology: Flowering mid summer–fall.
Habitat: Damp woods, gravel and ledges near streams, bogs.
Elevation: 0–600 m.

Distribution

Nfld. and Labr., N.S., Nunavut, Que., Maine.

Discussion

The circumscription of Euphrasia disjuncta follows that of E. Hultén (1941–1950, vol. 7, 1968) and P. D. Sell and P. F. Yeo (1970). According to the protologue, E. disjuncta was understood as having a disjunct distribution in western and eastern North America. Western populations (Alberta, Northwest Territories, and Alaska) are treated here as the chiefly glandular-pubescent E. subarctica; eastern populations are treated as typically eglandular E. disjuncta. The holotype (Fernald, Wiegand & Darlington 6169, GH) comprises only eglandular individuals and thus unambiguously assigns the name. Both glandular and eglandular forms are found growing mixed together, similar to the situation in E. subarctica; see additional comments under 1. E. subarctica.

Selected References

None.

Lower Taxa

None.

"broader" is not a number.

... more about "Euphrasia disjuncta"
Truncate (?) +  and Retuse (?) +
Galina Gussarova +
Fernald & Wiegand +
cuneate +
0.9 cm9 mm <br />0.009 m <br /> (1.15 cm11.5 mm <br />0.0115 m <br />) +
oval;suborbiculate;oval;suborbiculate;ovate +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
not leathery +  and fleshy +
alternate +  and subopposite +
ovate +  and obovate +
1 +  and 6 +
tubular +  and flattened +
not accrescent +
oblong;elliptic +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
(2.5-)3-5 times subtending leaves +
Polar eyebright +  and euphraise à aires disjointes +
0.4 cm4 mm <br />0.004 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
Nfld. and Labr. +, N.S. +, Nunavut +, Que. +  and Maine. +
0–600 m. +
2 +  and 1 +
indehiscent +, septicidal +, loculicidal +  and dehiscence +
Damp woods, gravel and ledges near streams, bogs. +
axillary +  and terminal +
deciduous +
triangular +
short-ciliate +  and glabrous +
crenate +  and crenate-serrate +
tenuinucellate +  and unitegmic +
campylotropous-like +
Flowering mid summer–fall. +
10 +  and 18 +
fusiform +
flexuous +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-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 +
Euphrasia arctica var. disjuncta +
Euphrasia disjuncta +
Euphrasia +
species +
longer than wide +
4 +, 3 +  and 1 +