Flora of the Palouse Region 143 



P. micranthum Renth. Annual, branched from the base, spreading, 6- 

 20 cm. high, somewhat viscidly-pubescent throughout: leaves mostly pe- 

 tioled, 1-4 cm. long; leaflets 5-13, obovate or lanceolate, acute or obtuse, 3- 

 8 mm. long: peduucles solitary, opposite the leaves: calyx-lobes triangular, 

 as long as the broadly campanulate tube: corolla white, rotate, not equalling 

 the calyx: ovules 2-3 in each cell. Sandy soil, infrequent. 



Family 64. HYDROPHYLXACEAE. 



Herbs, commonly hairy: leaves mostly alternate: Mowers per- 

 fect, regular, in dense one-sided cymes or false racemes: calyx 5- 

 parted or of 5 sepals: corolla gamopetalous, deeply 5-lobed: sta- 

 mens on the corolla-tube, alternate with its lobes: style 2-cleft, or 

 2 and separate; ovary entire, i-celled, with 2 parietal 

 placentae or 2-celled by the union of the placentae: fruit a 

 2-valved, 4-many-seeded capsule; endosperm copious. 



Leaves all radical. 239. hesperochiron. 



Leaves cauline and radical. 



Ovary with narrow parietal placentae. 238. phacelia. 



Ovary lined with dilated and fleshy placentae. 



Stamens and style longer than the corolla: flowers in clusters. 



236. HYDROPHVLU'M. 



Stamens and style shorter than the corolla: flowers solitary, axillary. 



237. nemophila. 



236. HYDROPHYLXUM. 



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

 Mowers 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 Meshy placentae; 

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



Flowers blue, in dense clusters. H. CAPITATU.M. 



Flowers whitish, in loose clusters. H. PEDDLER!. 



H. capitatlim Dougl. Rootstock short, with long fascicled fleshy roots; 

 stems exceeded by the leaves, 10-30 cm. high: leaves ovate, 5-10 cm. long, 

 soft-hairy, pinnately parted or divided into 5-7 lobes or divisions, these 

 cuneate, obovate, entire or coarsely toothed or cleft; petioles 6-12 cm. long, 

 generally longer than the blades: peduncles shorter than the petioles: inflor- 

 escence a dense round cyme, 2-4 cm. broad: calyx hispid, the divisions lan- 

 ceolate; no appendages in the sinuses: corolla blue. Moist stony places, 

 common. 



H. fendleri Heller. (If. albifrons Heller.) Roots densely fascicled: 

 stems 30-40 cm. high, exceeded by the leaves, sparingly hairy: leaves 10-20 

 cm. long, pinnately 5-7-divided; divisions ovate, incise! y and coarsely cleft 

 and toothed, 3-6 cm. long; lower petioles elongated: inflorescence a rather 

 dense cyme, exceeding the leaves: calyx soft-hispid, deeply 5-parted into 

 lanceolate divisions without appendages in the sinuses: corolla whitish. In 

 low copses, common. 



