220 SCROPHULARIACEAE. 



Anther-bearing stamens 2; sterile sta- 

 mens 2. 

 Sterile filaments 2-forked, exserted. 337. Ilysanthes, 226. 

 Sterile filaments simple, included. 334. Gratiola, 224. 

 Anther-bearing stamens 4. 



Corolla nearly regular. 339. Limosella, 226. 



Corolla 2-lipped. 



Stamens not enclosed in the 



upper lip. 340. Mimulus, 226. 



Stamens enclosed in the upper 

 lip. 

 Anther-cells equal. 



Calyx inflated in fruit; 



leaves opposite. 341. Rhinanthus, 228. 



Calyx not inflated; leaves 

 alternate or whorled. 342. Pedicularis, 229. 

 Anther-cells unequal. 



Corolla-lips unequal, the 



upper larger. 343. Castilleja, 229. 



Corolla-lips almost equal. 344. Orthocarpus, 230. 



328. 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. 



Plant densely woolly. V. thapsus. 



Plant glabrous or sparsely glandular. V. blattaria. 



Verbascum thapsus L. 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 gla- 

 brous, the others with hairy filaments. Introduced as a weed. 



Verbascum blattaria L. 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. Sparingly introduced. 



329. LINARIA. 



Ilirbs 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. 



Linaria linaria (L.) Karst. Butter and Eggs. Glabrous; stems erect, 

 30-100 cm. high; leaves linear, sessile, pale or glaucous, very numerous, 1-3 

 cm. long; inflorescence a dense raceme; calyx lobes oblong, acute; corolla 2-3 

 cm. long, yellow with an orange throat; seeds rough, winged. Introduced 

 along roadsides and in fields. 



