464 BOTANY. 



21. P. LINBAKIFOUA, Gray. Glabrous or sometimes roughish-pubesoeiit above, 6-12' high, corymb- 

 osely many-flowered ; leaves very narrowly linear, 1-2' long ; oalys strongly angled by the folded inter- 

 costal membranes, the teeth aoerose-snbnlate ; corolla-tube a little longer, the, Iqbes obovate-cuneate, 

 entire or rarely retuse ; ovules in pairs. — Idaho and Washington Territories. 



22. P. LONGIFOLIA, Nutt. Glabrous or pubescent, 2-12' high ; leaves very narrow or sometimes 

 lanceolate or oblong-lanceolate, l-S' long ; corolla-lobes entire or retuse ; ovules usually solitary. See 

 page 260. 



23. P. ADSTJKGENS, Torr. Glabrous, excepting the glandular-pubescent subcymose inflorescence ; 

 stems diffuse, ascending, slender, about 1° high ; leaves ovate or ovate-lanceolate, acute, i' long, usually 

 much shorter than the iuternodes ; corolla-tube nearly 1' long, about twice longer than the subterete 

 calyx, the lobes 5" long, obovate, entire ; style exserted ; ovules solitary. — Cauou Pass, Oregon ; only by 

 Wood. 



(6.) Style usually shorter than the stigmas and ovary; calyx cylindrical, with subulate lobes. 



24. P. SPECIOSA, Pursh. Somewhat visoid-puberulent or glabrate, 1-4° high, the branches ascending 

 from a woody decumbent base ; leaves lanceolate or linear, 1^-2' long, the upper mostly dilated at base ; 

 flowers corymbed ; corolla pink or white, the tube a little exceeding the calyx, the lobes obcordate, (or 

 in Tar. Sabini, obovate and entire or retuse;) ovules solitary. — From Washington Territory to Califor- 

 nia. Var. WooDHOUSii is a dwarf Arizona form with linear leaves, not dilated at base, and smaller 

 flowers. 



25. P. NANA, Nutt. Glaudular-pTibescent or roughish, sometimes glabrate, branches spreading from 

 a woody base, 6-12' high ; leaves linear, often alternate on the branches ; flowers scattered ; corolla pink 

 or white, the tube a little longer than the calyx, the limb 12-15" broad, with vei'y broadly cuneate-obo- 

 vate lobes, entire or slightly erose ; ovules 2 or usually 3 in each cell. — Western Texas to New Mexico 

 and S. Colorado. 



5 4. Annual Texan species, loosely branched, more or less viscid-hairy ; leaves rather broad, the upper 

 alternate ; calyx-lobes shortly bristle-tipped, soon recurved or spreading, splitting nearly to the 

 base in fruit ; style shorter than the stigmas ; seeds somewhat wing-angled. 



26. P. Dkummondii, Hook. Leaves usually lanceolate or oblong, the upper subcordate at base and 

 half-clasping ; flowers corymbed ; ovules solitary. 



27. P. Ecemeriana, Scheele. Low, loosely branched from the base, subglabrous ; leaves lanceolate, 

 oblong, or the lowest spatulate, the cauline mostly alternate, hirsute on the margins ; flowers scattered ; 

 corolla pink, the tube about equaling the spreading linear segments of the hirsute calyx, shorter than 

 the very broadly obovate (6-9" long) lobes ; ovules 4-5 in each cell. 



COLLOMIA. 



§ EUCOLLOMIA, Gray. Ovules solitary (in C, heteivjjhjlla 2-3) in each cell ; annuals, more or less 

 viscid-pubescent 



* Leaves sessile, simple; flowers usually crowded; calyx obconical; corolla narrow; seeds with 

 very abundant spiricles. 



(a.) Flowers in crowded leafy-bractod heads, or the lowest subsolitary in the forks. 



1. C. GRANDIFLOEA, Dougl. 1-2° high ; calyx-lobes broad, obtuse ; corolla 1' long, salmon-color. 

 See page 261. 



2. C. LINEARIS, Nutt. Smaller; calyx-lobes triangular-lanceolate, acute; corolla i' long. See 

 page S61. 



(6.) Flowers scattered, all solitary in the forks. 



3. C. TENELLA, Gray. Low, loosely branched ; leaves linear ; calyx-lobes triangular, acute ; corolla 

 purplish, 3-4" long. See page 262. 



* * licaves sessile, entire, the lower usually opposite ; flowers loosely cymose or scattered ; calyx 

 rounded at base, nearly 5-parted ; seed-coat without spiricles. 



4. C. GRACILIS, Dougl. Low, spreading ; leaves oval to linear ; calyx-lobes subulate-linear ; corolla 

 purplish, 5" long. See page 262. 



* * * Leaves pinnately divided, incised or 3-5-parted, the lower petioled, alternate ; calyx obtuse at 

 base ; corolla purplish, slender, 5-6" long, 2-3 times exceeding the calyx ; seed spiricles beneath a 

 delicate epidermis. 



5. C. GiLioiDES, Benth. |-2° high ; leaves nearly simply divided; flowers loose or scattered ; calyx 

 deeply cleft with linear-subulate lobes ; cells 1-2-ovulea ; capsule globular.— W. California. 



