134 SNAPDRAGON ORDER 



(b) Calyx teeth and tube about equal ; corol- 

 la 20-25 mm. long P. cystopterides 

 2. Leaves merely round-toothed 



a. Flowers white ; beak of galea long and coiled P. racemosa 



b. Flowers purple, rarely whitish ; beak none P. crenuldta 



Pentstemon Solander 1789 Pentstemon, Beard-tongue 



(Gr. pente, five, stemon, stamen, from the sterile stamen) 



PL 23, fig. 1-6. 



Sepals 5, united, petals 5, blue, purple, red or white, united into an 

 irregular 2-lipped corolla, tube elongated, more or less enlarged above, up- 

 per lip 2-lobed, lower lip 3-lobed, stamens 5 inserted on the corolla, in- 

 cluded, 4 of them fertile and in pairs, the fifth sterile, ovary with 2 cavities, 

 style thread-like, stigma globose, capsule ovoid, oblong or globose; flowers 

 in terminal racemes or panicles ; leaves opposite or rarely whorled, or the 

 upper occasionally alternate; perennial. 



1. Corolla red 



a. Corolla strongly 2-lipped 



( 1 ) Pedicel and calyx sticky-hairy ; anther cells 



split to middle only P. Bridgesii 



(2) Pedicel and calyx smooth; anther cells 



split to base ; leaves lance-linear P. barbdtus 



b. Corolla slightly 2-lipped, the lobes nearly 



equal ; leaves lance-ovate P. Edtoni 



2. Corolla blue, purple, rose or white 



a. Stems shrubby and woody at base 



(1) Corolla 2-4 cm. long; leaves obovate to 



oblanceolate, usually toothed P. fritticosus 



(2) Corolla 1-2 cm. long 



(a) Leaves lanceolate to lance-ovate, sharply 



toothed P. deiistus 



(b) Leaves linear to spatulate, entire 



x. Leaves obovate to oblanceolate P. caespitosus 



y. Leaves linear 



(x) Flowers alternate, single on very 



short stalks P. linarioides 



(y) Flowers opposite, in twos on long 



stalks P. ambiguus 



b. Stems herbaceous, often hard but not shrubby 



and twig-like at base 



