528 SCROPHULARIACEJE digitalis 



CASTILLK[A 



DIGITALIS L. Sp. 621. (1753) 



Tall biennial or perennial herbs with alternate leaves and large 

 showy red, white or purple Mowers in long terminal usually one- 

 sided racemes. Calyx 5-parted, the segments imbricated Corolla 

 declined, somewhat irregular, the tube contracted above the ovary, 

 then rather abruptly expanded, longer than the 4- or 5-lobed 

 slightly bilabiate limb : upper lip broadly emarginate or 2-cleft ; 

 lower one 3-lobed, the middle lobe largest, the lateral ones exterior 

 in the bud. Stamens 4, didynamous, ascending, mostly included ; 

 anthers approximate in pairs. Style slender, with 2-lobed stigma. 

 Capsule ovoid, septicidally dehiscent. Seeds numerous, rugose. 



D. purpueea L. Sp. 621. Pubescent: stems stout, 1-5 feet high: radi- 

 cal and lower cauline leaves ovate or ovate-lanceolate, 6-10 inches long, 

 slender-petioled, acute at the apex, narrowed at base, dentate : upper 

 leaves similar but smaller, sessile: racemes a foot long or more, dense, 

 one-sided: flowers various-colored, drooping: upper lobe of the calyx nar- 

 rower than the 4 other foliaceous ones: corolla \%-2 inches long, spotted 

 within. Common in rich alluvial soil, especially along the coast, western 

 Oregon to Brit. Columbia : Naturalized from Europe. 



Tribe vi Euphrasies Benth. in DC. Prodr. x, 189. Corolla 

 manifestly bilabiate: the upper lip erect and concave or galeate, entire 

 or emarginate, rarely 2-cleft; the lower 3-lobed, mostly spreading, 

 external in the bud. Stamens 4 and didynamous or rarely 2, as- 

 cending under the upper lip: anther-cells distinct, sometimes one 

 abortive or wanting. Style mostly filiform, with entire or 2-lobed 

 stigma. Capsule locidicidally dehiscent. 



§ Anther-cells unequal or dissimilar, the outer one affixed by its 

 middle, the other pendulous from its upper end, mostly smaller, some- 

 times sterile or deficient. Seeds with a loose reticulated coat. 



19 CASTILLEIA Mutis. L. f. Supp. 47. (1781) 



Herbs with alternate leaves and red, yellow, purple or white 

 flowers in dense terminal leafy-bracted spikes, the bracts often 

 brightly colored and much larger than the flowers. Calyx tubu- 

 lar, laterally flattened, more or less cleft before or behind, or both, 

 the lobes entire 2-cleft. Corolla tubular, very irregular, its tube 

 not longer than the calyx, its limb bilabiate ; upper lip (galea) 

 arched, elongated, concave or keeled, laterally compressed, entire, 

 enclosing the didynamous stamens: lower lip short, often very 

 small, 3-toothed, 3-carinate or somewhat saccate below the short 

 teeth. 



* Annuals with fibrous roots : at least the upper part of the bracts 

 and sometimes the calyx petaloid. 



C. minor Gray Bot. Cal. i, 573. Villous-pubescent : stem slender, 

 strict, simple or with 1 or 2 erect branches, 1-2)^ feet high : leaves all 

 linear- lanceolate and entire, sessile, acuminate, 2-3 inches long : bracts 

 similar to the leaves but smaller, red or red-tipped, very narrow, equalling 

 or longer than the short-pedicelled flowers: calyx green, cleft on both 

 sides to about the middle, the lobes lanceolate, acute, entire or 2-toothed : 



