408 HYDROPHYLLACEAE (WATERLEAF FAMILY) 



Perennials; leaves more or less silky. 



Caespitose; sericeous throughout . . . . . . 13. P. sencea. 



Scarcely caespitose; merely pubescent or finely hirsute . . 14. P. idahoensis. 



1. Phacelia Knightii A. Nels. Bull. Torr. Bot. Club 28: 229. 1901. A 

 diminutive annual 2-5 cm. high, minutely puberulent, simple or branched: 

 leaves few, semifleshy, orbicular to ovate, entire or nearly so, 5-10 mm. long: 

 flowers few, subspicate and nearly sessile in the uppermost axils: corolla 

 narrowly campanulate, about 5 mm. long, longer than the linear-spatulate 

 calyx-lobes, the limb purple, the tube -yellowish: seeds about 14, oblong, large 

 for the plant, conspicuously alveolate-hexagonal-reticulate, slightly wing- 

 margined by the cellular coat. In the crevices of the naked Wasatch clays, 

 western Wyoming. 



2. Phacelia linearis (Pursh) Holz. Contrib. Nat. Herb. 3: 242. 1895. 

 Stems 1-3 dm. high, at length paniculate-branched, hispid or roughish-hirsute, 

 usually also minutely cinereous-pubescent: leaves mostly sessile, linear or 

 lanceolate and entire or some of them deeply cleft; the lobes few or single, 

 linear or lanceolate, entire: spikes or spike-like racemes thyrsoid-paniculate, 

 at length elongated and erect : corolla bright violet or sometimes white : ovules 

 12-16: capsule shorter than the calyx; seeds oblong, coarsely favose-reticulated. 

 P. Menziesii. Wyoming to California and British Columbia. 



3. Phacelia leucophylla Torr. Frem. Rep. 93. 1845. Perennial by a stout 

 rootstock, pale, densely silky-pubescent; stems 3-5 dm. high: leaves lanceo- 

 late to oblong, 5-10 cm. long, the lower long-petioled : spike-like branches of 

 the scorpioid cymes dense, 2-8 cm. long; flowers sessile, numerous, about 

 8 mm. high: calyx-lobes hispid, oblong-lanceolate or linear, somewhat shorter 

 than the white or bluish, 5-lobed corolla: corolla-appendages in pairs between 

 the filaments: filaments exserted, glabrous or sparingly hairy: ovules 2 on 

 each placenta. P. drcinata. In dry soil; Colorado to North Dakota and to 

 Idaho. 



4. Phacelia heterophylla Pursh, Fl. 140. 1814. Much like the preceding 

 but probably only biennial, the stems single, or rarely more, from the semi- 

 fleshy root, erect, 3-5 dm. high; pubescence of two kinds, a fine canescence 

 and more or less hirsute-hispid hairs: leaves simple, or some of them with 

 divergent, lanceolate or linear lobes near the base : inflorescence hispid ; the 

 dense spikes thyrsoid-congested : corolla bluish, longer than the oblong- 

 lanceolate or linear calyx-lobes: filaments much exserted, sparingly bearded. 

 P. drcinata in part. (P. biennis A. Nels. 1. c. 26: 132.) Colorado and Wyo- 

 ming and west to the Pacific States. 



4a. Phacelia heterophylla alpina (Rydb.) A. Nels. Scarcely more than a 

 reduced form of alpine stations, tending to become perennial. (P. alpina 

 Rydb. Mem. N. Y. Bot. Card. 1: 324. 1900.) In the high mountains. 



5. Phacelia splendens Eastw. Zoe 4: 9. 1893. Annual, erect, 2-3 dm. 

 high, usually simple-stemmed; stems glandular or glabrous: leaves pinnately 

 parted into three or four pairs of alternate divisions, crenate or bluntly lobed 

 and oblique at base, nearly glabrous, glandular on the rachis: scorpioid cyme 

 on a naked peduncle; flowers on short pedicels: calyx white-hirsute and 

 slightly glandular, the lobes linear-lanceolate, 4-6 mm. long, slightly surpassing 

 the ripe capsule: corolla bright blue, rarely white, about 1 cm. in diameter, 

 divisions obtuse: stamens and style conspicuously exserted: capsule glandular 

 and hirsute; seeds with the central ridge very prominent, cymbiform, favose 

 over the whole surface, but not corrugated. In adobe soil; western Colorado 

 and Utah. 



6. Phacelia deserta A. Nels. 1. c. 25: 278. 1908. Stem erect, simple or 

 branched from the base, 1-2 dm. high, densely leafy at base, sparsely so up- 

 ward, the whole plant canescent with a short close pubescence, obscurely 

 glandular: leaves pinnate, the pinnae opposite, nearly oval and crenately 

 toothed, 5-9 pairs which are nearly equal in size: inflorescence dense, 

 paniculate, of scorpioid cymes: sepals equal, lanceolate-oblong: corolla bright 

 blue, turbinate-campanulate, 7 mm. long, lobes equaling or surpassing the 

 tube, rounded, entire; the obliquely vertical lamellae broad and conspicuous, 



