390 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



2. PTEROSPOBA Nutt. 



1. Pterospora andromedea Nutt. Pinedrops. Woods at Sun Camp, and doubtless 

 elsewhere. B. C. to Calif., Mex., Pa., and Que. — Plant unbranched, brownish or 

 purplish, very sticky; flowers whitish, the corolla 6 to 8 mm. long. 



Very common in many parts of the West, growing in pine woods. 



3. HYPOPITYS Adans. 



1. Hypopitys latisquama Rydb. Pinesap. Woods about the east entrance, and 

 probably elsewhere. B. C. to Mont, and N. Mex. — Plant pink, finely hairy above; 

 flowers about 1.5 cm. long. 



Related species are widely distributed in North America. 



66. ERICACEAE. Heath Family. 



Shrulis (sometimes very small) with alternate or opposite leaves; corolla of united 

 or distinct petals; fruit a cap-sule or drupe. 



Leaves opposite; corolla saucer-shaped 1. KALMIA. 



Leaves alternate; corolla not saucer-shaped. 



Leaves linear 2. PHYLLODOCE. 



Leaves much broader than linear. 

 Plants erect shrubs, 0.3 to 2 meters high; fruit a dry capsule. 



Leaves evergreen ; corolla of distinct petals 3. LEDUM. 



Leaves deciduous; corolla of united petals, urn-shaped . . 4. MENZIESIA. 

 Plants prostrate or creeping shrubs; fruit a drupe, or a capsule surrounded by a 

 fleshy calyx. 

 Leaves rounded; fruit a capsule, surrounded by the fleshy calyx. 



5. GATJLTHERIA. 

 Leaves wedge-shaped or obovate; fruit a drupe . . 6. ARCTOSTAPHYLOS. 



1. KALMIA L. 



1. Kalmia microphylla (Hook.) Heller. Rocky Mountain laurel. Common in 

 alpine meadows; also in sphagnum bog at Johns Lake. Alaska to Calif., Colo., and 

 Alta. — Erect glal^rous shrub, 10 to 40 cm. high; leaves evergreen, leathery, oval or 

 oblong, 1 to 2.5 cm. long, green on the upper surface, pale beneath; flowers bluish 

 purple, 10 to 15 mm. broad. 



A very beautiful plant when in full flower, but the flowers last only a short time. 

 At Johns Lake the plants are abundant, and they are much larger than those 

 •found at high altitudes. The stamens of this plant are of interest; there are 10 of 

 them; at first the anthers are held in little pockets of the outspread corolla, but if 

 the corolla is struck gently the anthers are released and the stamens stand erect. 

 The mountain laurel of the East {Kalmia latifoUa L.) is a related plant. 



2. PHYLLODOCE Salisb. 



Small erect shrubs, 10 to 30 cm. high, with densely leafy stems; flowers slender- 

 stalked, clustered at the ends of the branches; stamens 10; fruit a small capsule. 



(brolla deep rose, bell-shaped, open; sepals obtuse 1. P. empetrif ormis . 



Corolla yellowish white, urn-shaped, contracted at the mouth; sepals acute. 



2. P. glanduliflora. 



1. Phyllodoce empetriformis (Smith) Don. Red heather. Frequent and often 

 abundant in meadows above timber line. Alaska to Calif., Colo., and Alta. 

 {Bryanthus empetriformis A. Gray.) — Leaves evergreen, 5 to 12 mm. long, sessile, 

 grooved on both sides; corolla 6 to 8 mm, long. 



