316 SCROPHULARIACEAE. 



Stamens 4. 



Corolla nearly regular; leaves entire. 453. Limosella, 323. 

 Corolla 2-lipped; leaves usually not 

 entire. 

 Stamens not enclosed in the up- 

 per lip. 

 Leaves opposite; calyx pris- 

 matic. 4S4. Mimulus, 323. 

 Leaves alternate; calyx cam- 



panulate. 455. Digitalis, 325. 



Stamens enclosed in the upper 

 lip. 

 Anther cells equal, parallel. 

 Calyx inflated in fruit; 



leaves opposite. 456. Rhinanthus, 326. 



Calyx not inflated; leaves 



alternate or whorled. 457. Pedicularis, 326. 

 Anther cells unequal. 



Lips of corolla unequal, 



the upper larger. 458. Castilleja, 327. 



Lips of corolla subequal. 459. Orthocarpus, 329. 



442. VERBASCUM. Mullein. 



Tall and usually woolly biennial herbs; leaves alternate, the 

 cauline sessile or decurrent; flowers in large terminal spikes or 

 racemes; calyx 5-parted; corolla 5-lobed, rotate, the lobes slightly 

 unequal; stamens 5, all anther-bearing; style flattened at the 

 apex; capsule globular, many-seeded. 



Flowers in a spike; leaves densely woolly. V. thapsus. 



Flowers in a raceme; leaves glabrous or nearly so. V. blattaria. 



Verbascum thapsus L. Common Mullein. Densely woolly throughout, 

 the stout erect stems 1-2 m. high, somewhat .wing-angled by the decurrent 

 bases of the leaves; leaves thick, oblong, acute, entire or obscurely dentate, 

 narrowed toward the base, 10-30 cm. long, gradually reduced upwards; flowers 

 yellow, 16-20 mm. broad, in a dense long spike; stamens unequal, the two 

 lower and longer glabrous, the others with hairy filaments. 



Introduced from Europe. 



Verbascum blattaria L. Moth Mullein. Stems slender, erect, 30-60 

 cm. high, not angled, glabrous below, glandular-pubescent above; leaves 

 oblong, obtuse or the upper acute, crenate-dentate or cut-lobed, all but the 

 lower sessile and partly clasping, 6-8 cm. long ; raceme loose ; pedicels spreading ; 

 calyx glandular; corolla yellow or white, 2-2.5 cm. broad; stamens all with 

 hairy filaments; capsules subglobose, 6-7 mm. long. 



Introduced from Europe. 



443. LINARIA. 



Herbs with alternate leaves or the lower opposite; flowers in 

 terminal spikes or racemes; calyx 5-parted; corolla bilabiate, 

 spurred on the lower side, the throat nearly closed; stamens 

 didynamous; capsule thin, opening by pores beneath the summit. 



Flowers yellow, 25-30 mm. long. L. linaria. 



Flowers blue, 6-8 mm. long. L. canadensis. 



