62 UNIVERSITY OF COLOORAD STUDIES 
Vaccinium erythrococcum Rydb. RED BILBERRY 
A low shrub with very small leaves and bright red berries. Hills and forest openings. 
Altitude: 8,500 to 11,000 ft. Collection: Boulder County. 
Vaccinium oreophyllum Rydb. BLUEBERRY, HUCKLEBERRY 
Low shrub with angled branches and leaves about 1.5 cm. long; berry purplish- 
black. Very common in coniferous forests at about 10,000 ft. 
Altitude: 8,000 to 11,500 ft. Collections: Bald Mountain near Ward; Redrock 
Lake above Ward; Fourth of July Mine; foot of Long’s Peak. 
APOCYNACEAE, DocBANE FAMILY 
Apocynum ambigens Greene. DOGBANE 
This and the other species are perhaps technically herbs but are included here because 
of their general appearance. 
Altitude: 6,000 to 8,000 ft. Collections: Bear Canyon; head of Gregory Canyon; 
“Boulder” (Rydberg). 
Apocynum androsemaefolium Linn. DOGBANE 
A low, branching shrubby plant with an abundance of pink flowers in midsummer. 
Hillsides and forests. 
Altitude; 6,500 to 9,000 ft. Collections: South Boulder Canyon; north of Neder- 
land; Boulder County. 
Apocynum cannabinum Linn. INDIAN HEMP 
In river-bottom forests of the plains and lower foothills. 
Altitude: 4,900 to 6,500 ft. Collections: along the railroad track near Boulder 
station; Bluebell Canyon; “Boulder” (Rydberg). 
Apocynum hypericifolium Ait. DoGBANE 
Altitude: 5,000 to 6,000 ft. Collections: valley east of Boulder; “Boulder” (Ryd- 
berg). 
Apocynum lividum Greene. DOGBANE 
Altitude: 6,000 to 9,000 ft. Collection: Eldora. 
Apocynum scopulorum Greene 
Altitude: 6,000 to 9,000 ft. Collection: Sugarloaf. 
CAPRIFOLIACEAE, HoneysuckKLE FAMILY 
Linnaea americana Forbes. TWIN-FLOWER 
Low, trailing, evergreen plant with delicate pink flowers in two’s on long peduncles. 
Coniferous forests and north slopes. 
Altitude: 7,500 to 12,000 ft. Collections: Magnolia; Eldora; Spencer Mountain 
at Eldora; Foot of Arapahoe Peak; hill south of Ward; ‘South Boulder Peak” (Rydberg). 
Distegia involucrata (Richardson) Ckll. FLy HONEYSUCKLE 
A tall shrub in cold soil along stream-banks with deciduous trees. Common between 
8,000 and 9,000 ft. 
Altitude: 6,500 to 10,000 ft. Collections: South Boulder Canyon; Allenspark; 
Eldora; Spencer Mountain at Eldora; Redrock Lake west of Ward; near Ward; “be- 
tween Sunshine and Ward” (Rydberg). 
