Obdeb 87.— ACANTHAOEiE. 533 



R. Crista-gdlli 1. Mostly glabroiis; Iva. oblong or lanceolate; cor. scarcely a 

 third longer than the calyx ; appendages of the galea transversely ovate, broader 

 than long. — Meadows, Plymouth, Mass. to Arc. Am. St. a foot high, smooth, 

 branching. Lvs. opposite, nearly sessile, cordate-lanceolate, acutely serrate, 

 rough. Fls. axillary, crowded into a leafy spike. Cal. inflated, contracted at the 

 mouth, with 4 nearly equal teeth, and much shorter than the yellow, ringent 

 corolla, but becoming very large and inflated in fruit, rattling with the ripe seeds. 

 Jl. § Bur. 



34. EUPHRASIA, L. Eybbright. (Named for Euphrosine, one of 

 the Graces, meaning cheerfulness.) Calyx 4-cleft ; upper lip of the cor- 

 olla galeate, concave, apex 2-lobed, the lohes broad and spreading, lower 

 lip spreading, trifid, palate not folded ; stamens didynamous, ascending 

 beneath the galea ; capsule oblong, compressed, 00-seeded. — -Herbs -with 

 opposite lvs. and the lis. in spikes. 



E. ofBcinalis L. Lva. ovate or oblong, the cauline obtuse, crenate, floral (or 

 bracts) acute, cut-serrate with cuspidate teeth ; caL lobes subequal ; lower lip of 

 cor. -with its lobes deeply emarginate. — (J) A diminutive tenant of the "White Mts. 

 and Can., rare (common in Europe). Plant branched, slender, 2 to 6' high. Lvs. 

 1 to 3'' long. Pis. bluish -white, 3" long. 



35. MELAfflPY'RUffl, L. Cow Wheat, (Gr. ixaag, black, twpog, 

 •wheat ; the seeds blacken the flom- of wheat if ground with it.) Calyx 

 4-cleft ; upper lip of the corolla compressed ; the margin folded back ; 

 lower lip grooved, trifid ; capsule 2-celled, oblique, opening laterally ; 

 seeds 1 to 4, cylindric-oblong, smooth. — Herbs with opposite lvs. Fls. 

 solitary in the upper axils. 



M. prat^nse L. lvs. linear and lanceolate, petiolate, glabrous, the upper gener- 

 ally broader and toothed at base ; fls. axillary, distinct ; oal. teeth slender, half 

 as long as the corolla. — (J) Inhabits wood^ Can. to Ga^ "W. to Ky. St. with oppo- 

 site branches, 8 to 10' high, round, erect. Lvs. opposite, 1 to li' by 3 to 5", the 

 floral ones broader, -with (or without) setaceous teeth at base and tapering to an 

 obtuse point. Pis. in the axils of the upper leaves, yellowish, slender, the corolla 

 twice the length of the calyx. Jl. (M. Americanum Mx. dilfering from tho 

 European variety in its more slender corolla.) . 



Order LXXXVH. ACANTHACE^. Aoanths. 



Serbs or shrubs with opposite, shnple leaves and regular, bracted flowers. Calyx 



pentamerous, equal or unequal, imbricated in the bud. Corolla 5-meroug, tubular 



below, limb more or less bilabiate, convolute in bud. Slameris didynamous or dian- 



drous, inserted on the tube of the corolla. Fruii a 2-celled, 4 to 12-seeded capsule. 



Seeds supported by hooks or cup-shaped processes of the placenta;, oxalbuminous. 



Genera 155, species 1450, chiefly tropical, .1 few only, extending intothe United States. They 

 nro mostly destitute of active properties, and in .Tspect mere weeds. Yet amon^ them are many 

 remarkable for their beauty. Acantbn.s mollis is celebrated ns having, by its leaves, suggested 

 the style of tho Corinthian capital in architecture. 



SUBORDBES AND GENERA. 



I. ASEOMATACANTHEjE. Seeds destitute of hooked supports, (a) 



a Corolla regular. Seeds few, .adnato to a cup instead of a hook Tiiunbergia. 1 



a Corolla bilabiate. Seeds many, with p.apilla) instead of hooks Elytraeia. 2 



II. ECIIMATACANTHEjB. Seeds subtended by hooked processes, (b) 



b Corolla funnel-form, subregular stamens didynamous. (ItuELLiK.E.) (c) 



c Anthers 2-spurred at base. Capsule 4-seeded in the middle CoLOPnANF.s, 3 



C Anthers not spurred. Capsule 2 to 16-seeded from the middle Diptbuacantuus. 4 



C Anthers not spurred. Capsule 12 to 16-seeded from the base Cryimiiacakthus. 5 



b Corolla bilabiate, ringent. Stamens 4. Capsule 00 -seeded from the base.HyGaopjnLA. 6 



b Corolla bilabiate. &tamcns2. — Corolla resupinate, upper lip 8-tootbed Picliptera. T' 



— Corolla straight, lower lip 8-toothed. Wild.KuYTiOLOsSA. 8 

 — Corolla straight, lower lip 3-partcd. CultCTRTANTHERA. 9 



