PENTSTEMOM SCROPHULARIACE^ 517 



CHIONOPHILA 



sterile filament glabrous. In open places in the Siskiyou Mountains of 

 Oregon and California. 



P. heterophyllus Lindl. Bot. Reg. t. 1899. Glabrous or pruinose- 

 puberulent, scarcely glaucous: stems 1-2 feet high from a woody base, slen- 

 der, often diffusely branched : leaves lanceolate or linear or only the lowest 

 oblong-lanceolate, mostly narrowed at base, 1-4 inches long: corolla an inch 

 or sometimes more long, with narrow tube rose -purple or pink, sometimes 

 changing to violet, sterile filament glabrous. On rocky tops of the Siskiyou 

 Mountains in Oregon to Nevada. 



9 CHIONOPHILA Benth. in DC. Prodr. x, 351. 



Dwarf perennial herbs with thickish opposite leaves and tubular 

 flowers in simple spikes or racemes. Calyx funnelform, thin-me- 

 branaoeous, becoming scarious, merely and obtusely 5-loVed. Co- 

 rolla tubular, with slightly dilated throat and bilabiate limb : up- 

 per lip erect and slightly concave, barely 2-lobed, the sides some- 

 what recurved : lower with convex densely bearded base forming 

 a palate, and 3-lobed, the short lobes, recurving. Antheriferous 

 stamens 4, didynamous: anther-cells divaricate and confluent. Ste- 

 rile filament small and short or even minute, naked. Style filiform : 

 stigma minute entire. Capsule oblong enclosed in the marcescent 

 calyx and corolla, loculicidally 2-valved the valves soon 2-parted: 

 placental dissepiment flat. Seeds rather large, with a very loose 

 and arilliform cellular-reticulated outer coat. 



C. Tweedyi Henderson Bull. Torr. Club xxvii, 352. Dwarf peren- 

 nial: glabrous or nearly so: leaves thickish, entire, mostly in a radical tuftt 

 spatulate or lanceolate, tapering below into a scarious-margiued base: those 

 of the 1-3 inches high flowering stems 1 or 2 pairs, or sometimes alternate, 

 linear: flowers in a few-flowered raceme: calyx short and deeply lobed: 

 corolla saccate at baee dorsally, the lower lip strongly papillate. In the 

 Mountains of Idaho and adjacent Washington. 



Tribe 4 Gratiolese Benth. in DC. Prodr. x 9 189. Leaves oppo- 

 site or verticillate only the upper ones alternate. Inflorescence simple 

 and centripetal: the peduncles solitary in the axils of bracts or leaves 

 andebracteolate. Corolla from bilabiate to almost regular, not saccate 

 or otherwise produced at base. Antheriferous stamens % or 4 no rudi- 

 ments of the fifth. 



10 DIPLACUS Nutt. in Taylor's Ann. Nat. Hist, i, 137. 



Shrubs with opposite leaves and large yellow red or orange ax- 

 illary flowers on solitary peduncles. Calyx tubular, 5-angled or 

 5-toothed, persistent. Corolla tubular, bilabiate, the upper lip 2- 

 lobed, the lower 3-lobed, the lobes emarginate or variously toothed 

 or cleft. Fertile stamens 4. Style slender with bilamellate stigma. 

 Capsule linear-oblong, closely invested by the calyx and wholly 

 inclosed in it ; firm-coriaceous, with a woody tubercular enlarg- 

 ment at the apex, incompletely dehiscent, opening by the upper 

 suture only, from the base to near the apex, the valves spreading 

 into a boat-shaped open pod. Placentae distinct, borne on the 

 middle of the valves. Seeds small, very numerous. 



