FLOWERING PLANTS AND FERNS OF ARIZONA 791 



Key to the sp< c 



1. Corolla rotate (at least in early flowers), purple or whitish; leaf blades sinu- 

 ately denticulate or dentate, or pinnately cleft, cuneate at base, long- 

 pet ioled (2). 

 2. Plant perennial, sparsely whitish-scurfy, at least on the young pans: leaf 

 blades oblong to ovate: corolla violet or purple, with a white eye: anthers 

 yellow; seeds thick, coarsely and irregularly rugose on the back. 



1. P. LOBATA. 



2. Plant annual, not scurfy, sparsely puberulent or glabrate; leaf blades lanceo- 



late or oblong-lanceolate (exceptionally ovate); corolla (in early flowers) 



15 to 20 mm. in diameter, whitish, often with a large yellow eye; anthers 



purplish; seeds thin, not coarsely rugose on the back. 2. P. wrightii. 



1. Corolla campanulate, vellow or vellowish, usually with a brown or purplish 



eye (3). 



3. Pubescence partly of forked or stellate hairs, minute, cinereous, not or very 



slightly viscid; plant perennial: leaf blades broadly ovate or deltoid, 

 scarcely cordate at base, acute or acutish at apex, sinuate-dentate, 



usually shallowlv so; corolla open-campanulate 3. P. fexdleri. 



3. Pubescence of simple hairs (4). 



4. Stems and leaves conspicuously pubescent, many of the stern hairs 

 spreading (5). 

 5. Pubescence not viscid, rather sparse, many of the stem hairs long, 

 flat, segmented, tapering:; plant perennial; leaf blades lanceolate 

 or ovate-lanceolate, acute at both ends, entire to coarsely few- 

 toothed; corolla 15 to 20 mm. in diameter; fruiting calyx 25 to 



35 mm. long 4. P. laxceolata. 



5. Pubescence viscid, copious; leaf blades ovate, deltoid, or suborbi- 

 cular (6). 

 6. Plant annual: main stem erect, stout, seldom branching from the base: 

 leaf blades thin, broadly ovate to nearly orbicular, sparingly 

 repand-dentate to nearly entire, often subcordate at base; corolla 

 yellow or greeni.-h with a conspicuous dark eye; fruiting calyx 

 conspicuously acuminate; stem hairs slender, not noticeably 



tapering 5. P. pubescex>. 



6. Plants perennial; flowering stems from creeping rootstocks, usually 



diffusely branched from the base; leaf blades thickish, usually 



coarsely toothed; fruiting calyx not conspicuously acuminate (7). 



7. Leaf blades commonly at least 5 cm. long, acute or acuminate at 



apex; pubescence of both short glandular hairs, and long flat 



segmented hairs; corolla 15 mm. in diameter or larger; fruiting 



calyx 2.5 to 4 cm. long 6. P. heterophylla. 



7. Leaf blades commonly less than 5 cm. long, obtuse to acute at 

 apex: plant copiously glandular-pilose with very few, if any, 

 long flat segmented hairs; corolla commonly less than 15 mm. 

 in diameter: fruiting calyx not more than 2.5 cm. Ions;. 



7. P. HEDERAEFOLIA. 



4. Stems and leaves inconspicuously pubescent or glabrate, the hairs chiefly 

 minute, net or scarcely viscid; plants perennial (8). 

 8. Leaf blades lanceolate or oblong-lanceolate (exceptionally oblanceo- 

 late), entire or repand (exceptionally sinuate-dentate), usually 

 acuminate at both ends; herbage sparsely pubescent with short, 

 stiff, appressed or subappressed hairs, or often glabrate; flowering 

 stems from creeping rootstocks, stout, erect, sparingly branched; 

 corolla 15 to 25 mm. in diameter, pale yellow with a dark eye; 

 fruiting calyx 25 to 35 mm. long, ovoid, the teeth triangular- 

 lanceolate 8. P. LONGIFOIilA. 



8. Leaf blades broadly ovate, rounded deltoid, or suborbieular: herbage 

 persistently puberulent; flowering stems diffusely branched (9). 

 9. Leaf blades thin, coarsely and rather deeply sinuate-dentate: corolla 

 with a distinct eye, greenish yellow, drying purplish. 



9. P. VERSICOLOR. 



9. Leaf blades thickish, entire to shallowly sinuate-dentate: corolla 

 often without an eye, drying yellow: plant often suffrutoscent : 

 leaf blades occasionally subcordate 10. P. crassifolia. 



