OKDEU 89. ACANTHACE./E. 233 



cor. galeate, concave, apex 2-lobed, the lobes broad and spreading, lower 

 lip spreading, trifid, palate not folded. Sta. unequal, ascending beneath 

 the galea. Capsule oblong, compressed, oo-seeded. Herbs with opposite 

 kaves and the flowers in spikes. 



E. officinalis L. Lve. ovate or oblong, the cauline obtuse, crenate, bracts acute, cut- 

 aerrate with cuspidate teeth ; calyx lobes subequal ; corolla light-blue, lower lobea 

 deeply notched. White Mountains, Lake Superior. 2 (>'. Leaves 1 3''. 



43. MELAMFYRUM, L. Cow WHEAT. Calyx 4-cleft. Upper lip 

 of the corolla compressed, the margin folded back, lower lip grooved, tri- 

 fid. Caps. 2-celled, oblique, opening laterally. Seed* 1 4, cylindric-ob- 

 long, smooth. Herbs with opposite Ivs. Fls. solitary in the upper axils. 



Jtt. prateiise, . JimeHcdnutn (Benth.) Leaves linear-lanceolate, petiolate, glabrous, 

 the upper broader and toothed at base ; fls. axillary, distinct ; cal. teeth slender, half 

 as long as the yellowish corolla. (T) Woods : common. 6 10', branched. Jn. Sept. 



ORDER LXXXIX. ACANTHACE^E. ACANTHADS. 



Herls or shrubs with opposite, simple leaves and regular, bracted floweis. 

 Calyx 5-parted, equal or unequal, imbricated in the bud. Corolla 5-mcrous, 

 tubular below, limb more or less bilabiate, convolute in bud. Stamens 

 didynamous or diandrous, inserted on the tube of the corolla. Fruit a 

 2-celled, 4-12-seeded capsule. Seeds supported by hooks or cup-shaped 

 processes of the placentae, exalbuminous. 



5 Seeds destitute ofhvoked supports. . .(a) 



a Corolla regular. Seeds few, resting on little cups. Vines THUNBRRGIA. I 



a Corolla bilabiate. Seeds many, with no supports ELYTEAKIA. 2 



Seeds resting on hooks proceeding from the placentas. ...('> 



b Corolla funnel-form, subregular. Stamens 4, unequal RUEI.LIA. 3 



b Corolla bilabiate, ringent. Stamens 4. 1'od terete HruitoriiiijA. 4 



b Corolla labiate, the upper lip wanting. Stamens 4. t Rare ACANTHUS mollis 



b Corolla bilabiate. Siamens 2. c Corolla inverted, upper lip 3-toothed DICI.IPTKRA. 5 



c Corolla straight, lower lip 3-lobed DIANTUERA. 6 



c Corolla straight, lover "lip 3-parted ..CTUTANDKA. 7 



1. THUNB^RGIA, L. Calyx short, toothed or truncate, with 2 large 

 bractlets at base. Cor. funnel-be'll-form, limb 5-lobe>\, nearly regular. Sta. 

 4, unequal, included. Caps, beaked, 3-4-secded. 5 J> Fls. showy, axillary. 



T. A.LATA. A climbing vine, silky-hairy, with cordate-sagittate Ivs. on winged pet. ; 

 fls. H' deep and broad, purple, with a yellow, bufT, orange or wnite border. E. Africa. 



2. ELYTRARIA, Vahl. Calyx with 4 or 5 unequal segments. Cor. 

 bilabiate, lower lip of 3 bifid segments. Sta, 2 fertile, 2 sterile, included. 

 Caps. 8-sceded. Herbs acaulescent, with (oblong) leaves at base and clasp- 

 ing bracts on the scapes, and the small flowers in a terminal spike. 



. virgata MX. Scapes several, glabrous, covered with the bract?, which arc ovato, 

 cuspidate, ciliate, the upper subtending the white flowers ; calyx with 2 linear bract 

 lets at base, ciliate. if. Wet plains, S. Car. to Fla. If. August. 



3. RUE L LI A, L. Calyx 5-parted into slender segments. Cor. funnel- 

 form, limb spreading, subequally 5-lobed. Sta. 4, included, didyuamous 



