SAXn^^KAGACi:.^. (SAXIFKAGK FAMILY.) 'Jo 



8. PARNASSIA, Touru. Gkass of Taknassus. 



Perennial smooth herbs, with tlie leaves entire and cliiutly radical, an<l the 

 large solitary flowers terminating the long naked stems. Petals white, with 

 greenish or yellowish veins. 



* Petals sessile, entire. 



1. P. parviflora, DC. Leaves oi'ate or oblong, taperintj at the base : petal.-* 

 little longer tlian the calyx: sterile Jilaments about 5 in each set. — Along 

 streams in the mountains and eastward to Lake Michigan. 



2. P. palustris, L. Leaves heart-shaped : flower nearly an inch broad : 

 petals rather longer than the calyx, few-veined : sterile Jilaments 9 to 15 in each 

 set. — Montana and Wyoming, eastward to Lake Superior, and throughout 

 British America. 



* * Petals contracted into a short claw, frinfjed. 



3. P. fimbriata, Banks. Leaves from reniform to cordate-ovate : the 

 margin of the petals fringed below the middle or towards the base : sterile 

 filaments 5 to 9 in each set and united below into a fleshy carinate scale, or 

 sometimes a dilated scale destitute of bristle-like filaments. — From Colorado 

 to California and northward to British America. 



9. PHILADELPHUS, L. Syringa. Mock Orange. 



Calyx-limb 4 to 5-parted. Petals rounded or obovate, large. Styles 3 to 5, 

 united below or nearly to the top. Seeds with a loose membranaceous coat 

 prolonged at both ends. — In ours the leaves are entire, and the showy white 

 flowers 1 to 3, terminal. 



1. P. microphyllus, Gray. Branches slender, erect: leaves small, G 

 to 9 lines long, ovate-lanceolate or oblong, shining above, pale and minutely 

 pilose beneath, narrowed at base into a very short petiole : calyx 4-cleft, gla- 

 brous without, tomentulose within : styles united to the apex. — PL Fendl. 54. 

 S. Colorado and southward. 



10. JAMESIA, Torr. & Gray. 



Calyx-lobes sometimes bifid. Petals 5, obovate. Alternate stamens shorter; 

 filaments linear, flattened acuminate. Capsule included. Seeds striate-reticu- 

 late. — Low, diffusely branching, 2 to 3 feet high : leaves ovate, raucronately 

 serrate, canescent beneath, as well as tlie petioles, calyx, and branchlets, with 

 a soft hairy pubescence : flowers cymose, in terminal ])anicles. 



1. J. Americana, Torr. & Gray. Cymes often longer than the loaves, 

 5 to 10-flowered : petals white, glabrous or softly hairy within : calyx-lobes 

 shorter than the petals, enlarged and foliaceous in fruit. — Fl. i. 593. Utah. 

 Colorado, and New Mexico. 



11. FENDLERA, Eng. & Gray. 



Calyx-tube 8-ribbed. Petals ovate-deltoid, unguiculate, omarginato. Sta- 

 mens 8 : filaments 2-forked at the apex, tlie lobes divaricate and extondod 

 beyond the cuspidate anther. Capsule crustaceous. Seeds reticulate, winged 

 below. — Erect shrub. 



