4 6 



HYDROPHYLLACEAE. 



[Vol.. III. 



4. PHACELIA Juss. Gen. PI. 127. 1789. 



Annual or rarely perennial, mostly hirsute hispid or scabrous herbs, with alternate en- 

 tire 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 catnpanulate, 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 be- 

 low; 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, re- 

 ferring to the clustered flowers of some species.] 



About 80 species, natives of the New World. Besides the following, some 50 others occur in 

 the western parts of North America. 



Corolla-lobes entire. 



Corolla manifestly appendaged within, between the stamens. 

 Leaves entire. 

 Leaves erenate-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" -5" broad. 

 Hirsute; flowers 6" -7" broad. 

 Filaments glabrous; calyx-lobes linear. 

 Corolla nearly rotate, its lobes fimbriate. 



Lobes of the leaves and calyx acute. 8. P. Purshii. 



Lobes of the leaves and calyx obtuse. 9. P. fimb?-iata. 



P. leucophylla. 

 P. integrifolia. 



P. bipinnatifida. 

 P. Franklinii. 



P. 

 P. 

 P. 



dubia. 



hirsuta. 



Covillei. 



i. Phacelia leucophylla Torr. 



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-i^ high; leaves lanceo- 

 late to oblong, entire, pinnately veined, 2 / -4 / long, 

 4 // -i2 // wide, the lower long-petioled, the upper ses- 

 sile or nearly so; spike-like branches of the scorpioid 

 cymes very dense, nearly straight and i / -3 / long 

 when expanded; flowers sessile, very numerous, 

 about 4 // high; calyx-lobes hispid, oblong-lanceo- 

 late or linear, somewhat shorter than the white or 

 bluish, 5-lobed corolla; corolla-appendages conspicu- 

 ous, in pairs between the filaments; filaments ex- 

 serted glabrous; ovules 2 on each placenta; capsule 

 ovoid. 



In dry soil, South Dakota to Idaho and western Ne- 

 braska. May-Aug. The species has been taken for P. 

 heterophylla Pursh, of the far west, which has spreading 

 brown hairs, some of the leaves usually pinnatifid, and 

 pilose filaments. 



Silky Phacelia. 



(Fig. 3002 



< . 1 1 1 1 - l. '*. 



) 



2. Phacelia integrifolia Torr. Crenate- 



leaved Phacelia. (Fig. 3003.) 

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



Annual or biennial; stem erect or ascending, 

 rather stout, very leafy, commonly branched above, 

 viscid-hirsute, 6 / -2 high. Leaves finely strigose- 

 pubescent, ovate-oblong or oblong-lanceolate, irre- 

 gularly erenate-dentate, obtuse at the apex, rounded 

 or cordate at the base, i / -2)4 / 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 ob- 

 long, acute; corolla tubular-campanulate, white or 

 blue, its tube longer then the calyx; filaments gla. 

 brous, exserted; ovules 2 on each placenta; capsule 

 ovoid, obtuse. 



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

 Smyth), Colorado to Mexico, Utah and Arizona. April- 

 Sept. 



