298 HYDROPHYLLACEAE. 



form, commonly with appendages inside of the tube, consisting 

 of 10 vertical plaits in pairs between the bases of the filaments; 

 stamens equally inserted at or near the base of the corolla; 

 ovary with narrow parietal placentae; ovules and seeds 4- 

 numerous. 



Leaves with many lobes. P. sericea. 

 Leaves entire or with few lobes or divisions. 



Flowers bright blue, rather large. P. linearis. 



Flowers whitish, rather small. P. nemoralis. 



Phacelia sericea (Graham) Gray. Perennial; stems 15-20 cm. high, leafy; 

 leaves silky-pubescent, pinnate, with numerous narrow lobes; flowers in a 

 dense spike-like cyme; corolla violet. 



In the Cascade and Oh'mpic Mountains, at high elevations. A very 

 handsome species. 



Phacelia linearis (Pursh) Holzinger. Annual, 10-50 cm. high, simple 

 below the inflorescence; whole plant rough-hairy, usually with some shorter 

 white pubescence; leaves sessile, linear or lanceolate, entire or cleft into 2-5 

 narrow lobes; inflorescence usually branched, consisting of spike-like racemes; 

 pedicels short; calyx-lobes linear, hispid-ciliate; corolla violet-blue, nearly 

 rotate, 12-15 mm. broad; appendages 10, narrow, free from the filaments; 

 stamens equalling the corolla; filaments sparsely hairy; style 2-cleft; capsule 

 shorter than the calyx; ovules 12-16; seeds pitted-reticulate. 



Dry prairies, rare in our limits; Whidby Island, Gardner. 



Phacelia nemoralis Greene. Hirsute-pubescent throughout but green, 

 not hoar>'; leaves long-petioled, ovate-oblong, entire, simple or the lower ones 

 with one or two pairs of small leaflets; flowers in dense spike-like cymes; 

 corolla greenish-yellow. 



Dry prairies, not common. Very closely related to P. heterophylla Pursh 

 which differs mainly in the herbage being canescent. 



412. HYDROPHYLLUM. Waterleaf. 



Perennial herbs; leaves long-petioled, mostly pinnately-parted ; 

 flowers white or violet, in cymose dense clusters; calyx 5-parted 

 into narrow divisions; corolla bell-shaped, a nectariferous grooved 

 appendage opposite each lobe; stamens and style exserted beyond 

 the corolla-lobes; ovary lined with dilated and fleshy placentae; 

 ovules 4; capsule 2-valved, 1-4-seeded. 



Calyx-lobes smooth on the back; flowers pale violet; basal leaves 



with 5 approximate segments. H. tenuipes. 



Calyx-lobes pubescent on the back; flowers white; leaves with 



5-9 scattered segments, paler beneath. H. albifrons. 



Hydrophyllum tenuipes Heller. Stems about 30 cm. high; leaves long- 

 petioled, nearly all 5-parted or divided; segments close together, acuminate, 

 coarsely toothed or incised, somewhat paler beneath; calyx-lobes bristly- 

 margined, otherwise smooth; corolla pale violet. 



In moist woods, common. A form which occurs near Ilwaco has darker 

 flowers and thicker doubly dentate leaves. It may be distinct. 



Hydrophyllum albifrons Heller. Roots densely fascicled; stems 30-40 cm. 

 high, exceeded by the leaves, sparingly hairy; leaves 10-20 cm. long, pinnately 



