320 
Corolla campanulate, yellow, 3-8 mm. in diameter; leaves Rar tocthed or sub- 
entire. . P, lanceifolia. 
66, Peduncles scarcely exceeding the fruiting inr 
Corolla campanulate, yellow, 8-10 mm. in diameter ; leaves sharply dentate. 
iz a ulata. 
IV. Fruiting calyx obscurely 5-10-angled, not sunken at the base; corolla yellow 
with a brown or purple center. 
Padsinatis short, scarcely as long as the flowers, which are I-I E cm. in diameter ; 
broadly triangular. . Pixocarpa. 
Peduncles a than the flowers which are 112-277 cm. in dance, calyx-lobes 
lanceolate-triangular. 4. P. Philadelphica. 
B, Perennials. 
a. LOBES OF THE FRUITING CALYX MORE OR LESS CONNIVENT ; FLOWERS GENERALLY 
A BROWNISH OR PURPLISH CEN 
* Pubescence not stellate (although in Z. pumila of branched hairs). 
XV. Pubescence on the leaves none, on the upper part of es stem and the calyx sparse 
and short, if any; flowers large, 112—214 cm. in diam 
aa, Fruiting calyx ovoid, nearly filled with the berry, ve sunken at the base. 
Plant tall and erect; leaves ovate-lanceolate to broadly ovate, usually thin. 
14. P. Philadelphica. 
Plant usually tall; leaves lanceolate, oblanceolate or linear. 15. P. longifolia. 
Plant low and spreading; leaves more or less fleshy, elliptic-oblong, BEE into a 
winged petiole. 16, 65 Jer 
68. Fruiting calyx pyramidal, very much inflated and deeply sunken at suc El 
Leaves broadly ovate, usually coarsely dentate. 17. P. macrophysa. 
V. Pubescence sparse, consisting of flat, sometimes jointed, and in Z. pumila branched 
hairs, in P, Vzrgznzana and P. arenicola sometimes a little viscid. 
aa. Fruiting calyx ovoid, Prid angled and scarcely sunken at the base; leaves 
thic e or spatulate to rhomboid, war 
Leaves obovate or spatulate ; pd all simple. . P, lanceolata. 
Leaves broader, inclined to be rhomboid; hairs on the lower ais of the leaves 
branched. I . pumila, 
66. Fruiting calyx pyramidal, more or less Z-angled and deeply SEN at the base; 
leaves ovate or cordate to lanceolate, generally moré or less dentate 
Fruiting eds ovoid-pyramidal; stem stout; rootstock somewhat fleshy ; Ihres ovate 
or lanceolate, 20. P. Virginiana. 
Fruiting bs oblong-pyramidal or nearly cylindrical; stem and rootstock generally 
very slender; leaves broadly ovate to cordate, coarsely toothed and reticulate. 
21. P. arenicola. 
Fruiting calyx oblong-pyramidal; stem and rootstock very slender; leaves ovate, 
truncate, or rarely slightly cordate at the base, subentire; veins not prominent. 
2 ciliosa. 
VI. Pubescence dense, short, more or less viscid or M eroe E in ?. Peru- 
viana), often mixed with long flat jointed hai 
«a, Pubescence not viscid, short, peduncles uud shorter than the leaves. 
