SCROPHULARIACEAE. 84I 



corolla very irregular, the tube cylindric, the limb 2-lipped; upper lip arched, 

 concave, entire; lower lip somewhat shorter. 3-lobed. 2 -plaited. Stamens 4, didyna- 

 mous, ascending within the upper lip; anther-sacs equal. Style filiform. Cap- 

 sule oblong, many-seeded. Seeds linear, with a loose reticulated testa. [Named 

 for C. G. Schwalbe, of Holland, who wrote (17 19) on Farther India.] A mono- 

 typic genus. 



1. Schwalbea Americana L. Chaff-seed. (I. F. f. 3324.) Stem strict, 

 3-6 dm. high. Leaves oblong, or ovate-oblong, entire, acute at both ends, 

 2.5-4 cm. long, the upper gradually passing into the bracts of the rather loose 

 spike; flowers nearly sessile, 2.5-4 cm. long, longer than the bracts; bractlets at the 

 base of the calyx linear; corolla-tube slightly exceeding the lower lobes of the 

 calyx, these connate to near their apices; capsule enclosed by the calyx. In wet 

 sandy soil, eastern Mass. to Fla. and La., near the coast. May-July. 



29. EUPHRASIA L. (See Appendix.) 



Low herbs, parasitic on other plants, with opposite dentate or incised leaves, 

 and small flowers in terminal leafy-bracted spikes. Calyx not bracteolate, 4-cleft 

 (rarely 5-cleft, with one of the lobes much smaller than the others). Corolla very 

 irregular, 2-lipped, the upper lip erect, 2-lobed, its margins recurved; lower lip 

 larger, 3-lobed, spreading, its lobes emarginate or obtuse. Stamens 4, didyna- 

 mous. ascending under the upper lip; anther-sacs equal, parallel, mucronate at the 

 base. Capsule oblong, locuiicidally dehiscent, many-seeded. Seeds oblong, longi- 

 tudinally ribbed. [Greek, delight.] About no species, of temperate and cold 

 regions. Besides the following, another occurs in northwestern N. Am. 



Bracts, and usually the leaves, glandular, at least beneath. 



Spike short; teeth of the bracts merely acute. 1. E. latifolia. 



Spike elongated, dense ; lower teeth of the bracts aristate. 2. E. Canadensis. 



Neither bracts nor leaves glandular, but usually pubescent. 



Spikes elongated; bracts sharply toothed; plant 10-25 cm - high. 



3. E. Americana. 

 Spike short, capitate; bracts bluntly toothed; plant 2-5 cm. high. 



4. E. Oakesii. 



1. Euphrasia latifolia Pursh. Glandular Eyebright. (I. F. f. 3325.) 

 Stem erect, simple, or with a few erect branches, pubescent with crisped hairs, 

 5-18 cm. high. Leaves ovate to obovate, obtuse, 2-5-toothed on each side, the 

 teeth sharp or blunt; spike 2-4 cm. long, the bracts broadly oval to orbicular. 

 cuneate at the base, sharply toothed, glandular-pubescent beneath or also on the 

 margins; calyx-teeth acute; corolla 6-8 mm. long, lilac, or variegated; capsule 

 oblong-elliptic, ciliate on the margins, and more or less pubescent or pilose, about 

 as long as the calyx. Greenland to Hudson Bay and Me. Also in Europe. 

 Summer. 



2. Euphrasia Canadensis Townsend. Spinulose Eyebright. Branched 

 from near the base, 8-15 cm. high, the stem and branches with crisped hairs. 

 Leaves ovate-oblong, the teeth of the upper aristate; bracts about 5 -toothed; spike 

 3-7 cm. long; calyx-teeth triangular-lanceolate, aristate; corolla about 7 mm. long; 

 capsule truncate or emarginate. mucronate. Fields, Quebec to N. H. Summer. 



3. Euphrasia Americana Wettst. Hairy Eyebright. (I. F. f. 33-6.) 

 Pubescent with crisped hairs; stem often at length much branched, 10-25 cm - Ligh. 

 Leaves sessile, ovate to oval, 3-5 -toothed on each side; the teeth acute; Lracts 

 dentate, pubescent, slightly shorter than the flowers; calyx-teeth lanceolate, acu- 

 minate; corolla 6-8 mm. long, purplish or nearly white, its lobes emarginate; 

 capsule narrow, cuneate, 4-6 mm. high, about equalling the calyx. In fields and 

 on hills, Me. and N. B. to Newf. Summer. 



4. Euphrasia Oakesii Wettst. Oakes' Eyebright. (I. F. f. 3227.) Stem 

 erect or ascending, very slender or filiform, simple, 2-5 cm. high, somewhat 

 pubescent. Stem leaves 2 or 3 pairs. Bracts and leaves orbicular or broadly oval, 

 narrowed or nearly truncate at the base, 4-6 mm. long, obtuse, pubescent, with 

 2-5 blunt teeth on each side; spike short, capitate, only 6-IO mm. long, the bracts 

 densely imbricated; calyx teeth triangular-lanceolate, short; corolla 2-3 mm. long, 

 purplish; capsule oblong-elliptic, ciliate, longer than the calyx. White Moun- 

 tains of N. H. 



