298 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



60. PARNASSIACEAE. Flower-of- Parnassus Family. 



1. PARNASSIA L. Flower-of-Parnassus. 



Glabrous perennial herbs with short rootstocks and scapiform stems; leaves entire, 

 mostly basal and petioled, the single cauline leaf sessile; flowers solitary, terminating 

 the scape; sepals 5, green; petals 5, white, conspicuously veined; stamens 5, alternate 

 with the petals and with the 5 clusters til' gland-bearing staminodia; capsule 1-celled, 

 with 3 or 4 valves; seeds numerous, winged. 



KEY TO THE SPECIES. 



Petals fimbriate on the sides near the base 1. /'. fimbriata. 



Petals entire 2. /'. parviflora. 



1. Pamassia fimbriata Konig, Ann. Bot. Kon. & Sims 1: 391. 1805. 

 Type locality: "On the coast of northwest America." 



Range: Alaska and Alberta to California and northern New Mexico. 

 New Mexico: Truchas Peak (Standley 4768). Wet ground, in the Arctic-Alpine 

 Zone. 



2. Pamassia parviflora DC. Prodr. 1: 320. 1824. 

 Type locality: North America. 



Range: British America to South Dakota, Utah, and New Mexico. 

 New Mexico: Rio Pueblo; headwaters of the Pecos; White Mountains. Wet 

 ground, in the Transition Zone. 



61. HYDRANGEACEAE. Hydrangea Family. 



Low or tall widely branching shrubs with opposite branches; leaves opposite, exstip- 

 ulate, simple, more or less persistent, entire or toothed; flowers perfect, with mostly 

 conspicuous white or yellowish petals, solitary or cymose; calyx of 4 or 5 sepals sur- 

 mounting the hypanthium; stamens numerous, the filaments slender or sometimes 

 stout, then appendaged; ovary partly inferior; fruit a woody capsule. 



KEY TO THE GENERA. 



Flowers in cymes, very numerous; sepals and petals 5; 

 stamens 10. 

 Plants large, often 2 meters high; leaves large, 



toothed 1. Edwinia (p. 298). 



Plants small, depressed; leaves small, entire 2. Fendlerella (p. 299). 



Flowers solitary or in 2 or 3-flowered clusters; sepals and 

 petals 4 or 5, usually 4; stamens 8 or numerous 

 (15 to 60). 

 Filaments appendaged; flowers uniformly 4-parted; 



stamens 8 3. Fendlera (p. 299). 



Filaments not appendaged; flowers occasionally 5- 



parted; stamens 15 to 60 4. Philadelphia (p. 300). 



1. EDWINIA Heller. 



A rather large shrub, often 2 meters high, with opposite branches and brownish, 

 partly deciduous bark; leaves deciduous, thin, ovate, petiolate, serrate, 10 cm. long 

 or less, bright green above, pale or whitish-toinentulose beneath; flowers in crowded 

 cymes, white, 5-parted. 



