68 



HYDROPHYLLACEAE. 



VOL. III. 



4. PHACELIA Juss.; J. F. Gmel. Syst. 330. 1791. 



Annual, biennial or perennial, mostly hirsute hispid or scabrous herbs, with alternate entire 

 dentate lobed pinnatifid or dissected leaves, the lowest rarely opposite, and blue purple violet 

 or white flowers in terminal scorpioid cymes or racemes. Calyx 5-lobed, somewhat enlarging 

 in fruit; sinuses not appendaged. Corolla campanulate, nearly rotate, tubular or funnelform, 

 the tube sometimes appendaged within, opposite the lobes, the lobes imbricated in the bud. 

 Stamens exserted or included, attached near the base of the corolla; anthers mostly ovate. 

 Ovary i-celled, the 2 placentae narrow, affixed to the walls; styles united below; ovules 2 or 

 several on each placenta. Capsule i-celled, or falsely nearly 2-celled by the intrusion of the 

 placentae, 2-valved. Seeds usually reticulated. [Greek, a cluster, referring to the clustered 

 flowers of some species.] 



About 90 species, natives of the New World. Besides the following, some 60 others occur in 

 the western parts of North America. Type species : Phacelia secunda J. F. Gmel. 



Corolla-lobes entire. 



Corolla manifestly appendaged within, between the stamens. 

 Leaves entire. 

 Leaves crenate-dentate. 



Leaves pinnately divided, or pinnatifid, the segments incised. 

 Racemes loose ; pedicels slender ; ovules 2 on each placenta. 

 Racemes dense ; pedicels short ; ovules numerous. 

 Appendages of the corolla inconspicuous or none. 

 Filaments pubescent ; calyx-lobes oblong. 

 Puberulent ; flowers 4"-s" broad. 

 Hirsute ; flowers 6" -7" broad. 

 Filaments glabrous ; calyx-lobes linear. 

 Corolla nearly rotate, its lobes fimbriate. 

 Lobes of the leaves and calyx acute. 

 Lobes of the leaves and calyx obtuse. 



1. P. leucophylla. 



2. P. integrifolia. 



3. P. bipinnatifida. 



4. P. Franklinii. 



5. P. dubia. 



6. P. hirsnta. 



7. P. Covillei. 



8. P.Purshii. 



9. P. fimbriata. 



i. Phacelia leucophylla Torr. Silky Phacelia. Fig. 3490. 



Phacelia leucophylla Torr. Frem. Rep. 93. 1845. 



Perennial by a stout rootstock, pale, densely silky- 

 pubescent, the hairs appressed or ascending. Stem 

 simple or branched, i-ii high; leaves lanceolate to 

 oblong, entire, pinnately veined, 2'-4' long, 4' -12 

 wide, the lower long-petioled, the upper sessile or 

 nearly so; spike-like branches of the scorpioid cymes 

 very dense, nearly straight and i'-3' long when ex- 

 panded; flowers sessile, very numerous, about 4 high; 

 calyx-lobes hispid, oblong-lanceolate or linear, some- 

 what shorter than the white or bluish, 5-lobed corolla ; 

 corolla-appendages conspicuous, in pairs between the 

 filaments; filaments exserted, glabrous; ovules 2 on 

 each placenta; capsule ovoid. 



In dry soil, South Dakota to Idaho, British Columbia, 

 Nebraska and Colorado. May-Aug. The species has 

 been taken for P. heterophylla Pursh, of the far west, 

 which has spreading brown hairs, some of the leaves usu- 

 ally pinnatifid, and pilose filaments. 



2. Phacelia integrifolia Torr. Crenate- 

 leaved Phacelia. Fig. 3491. 



P. integrifolia Torr. Ann. Lye. N. Y. 2 : 222. pi. 3. 1827. 



Annual or biennial ; stem erect or ascending, rather 

 stout, very leafy, commonly branched above, viscid- 

 hirsute, 6'-2 high. Leaves finely sfrigose-pubescent, 

 ovate-oblong or oblong-lanceolate, irregularly cre- 

 nate-dentate, obtuse at the apex, rounded or cordate 

 at the base, i'-2*' long, petioled or the uppermost 

 sessile; spike-like branches of the scorpioid cymes 

 dense, 2'~4' long when expanded; flowers sessile, 

 about 4" long; calyx-segments oblong, acute; corolla 

 tubular-campanulate, white or blue, its tube longer 

 than the calyx; filaments glabrous, exserted; ovules 

 2 on each placenta; capsule ovoid, obtuse. 



In saline soil, western Kansas (according to B. B. 

 Smyth) ; Oklahoma to Colorado, Mexico, Utah and Ari- 

 zona. April-Sept. 



