224 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



121. VACCINIACEAE. Blueberry Family. 



Lower surface of the leaves covered v?ith minute wax globules, these conspicuous 

 under a lens; calyx lobes with sessile or stalked glands; seeds 10, arranged in a 



ring, surrounded by a bony covering at maturity 1. GAYLTJSSACIA. 



Lower surface of the leaves without wax globules; calyx lobes without glands; seeds 

 numerous, not in a ring, lying naked in the pulp of the berry. 

 Stamen tips projecting from the mouth of the corolla, each anther with 2 spurlike 

 appendages; bracts of the inflorescence green, persisting until the maturity of 



the fruit; pedicel not jointed 2. POLYCODITTM. 



Stamens included within the corolla, the anthers not appendaged; bracts deciduous 

 after flowering; pedicel jointed to the base of the flower 3. VACCINIUM. 



1. GAYLUSSACIA H. B. K. Huckleberry. 



Leaves somewhat glaucous beneath, without wax globules on the upper surface; 

 young twigs glabrous; corolla 3-A mm. long; filaments glabrous; berry light blue, 



with a dense bloom, usually much shorter than the pedicel 1. G. frondosa. 



Leaves green, with wax globules or stalked glands on both surfaces; young twigs 



pubescent; corolla 5-7 mm. long; filaments hairy; berry black and shining, or 



blue with a usually thin bloom, commonly equaling or longer than the pedicel. 



Bracts about half as long as the pedicels, deciduous after flowering; ovary, and 



usually the bracts and pedicels, with sessile wax globules; corolla red, about 



5 mm. long, 2-3 times as long as broad;, berry glabrous 2. G. baccata. 



Bracts equaling or longer than the pedicels, persistent in fruit; ovary, bracts, and 

 pedicels with stalked glands; corolla white, about 7 mm. long, 1-1.5 times as 

 long as broad; berry hairy 3. G. dumosa. 



1. Gaylussacia frondosa (L.) Torr. & Gray. Dangleberey. 

 Swamps or dry or moist woods, chiefly eastward ; common. May; fr. July. Eastern 



U.S. 



2. Gaylussacia baccata (Wang.) K. Koch. Black huckleberry. 

 Dry or moist woods or hillsides; common. May; fr. June-July. Eastern N. Amer. 



G. resinosa Torr. & Gray.) 



3. Gaylussacia dumosa (Andr.) Torr. & Gray. Dwarf huckleberry. 

 Swamps and low woods, northeastward; infrequent. May- June; fr. July-Aug. East- 

 ern N. Amer. {G. dumosa hirtella A. Gray.) 



2. POLYCODIUM Raf. 



1. Polycodium stamineum (L.) Greene. Deerberry. 



Dry or moist woods; common. May-June; fr. July-Sept. Eastern U. S. {Vaccin- 

 ium stamineum L.) 



Sometimes known as hog huckleberry. A flowering branch is shown in plate 40. 



3. VACCINIUM L, Blueberry. 



Plants usually 25-60 cm. high, forming patches by means of rootstocks; bark remaining 

 green and smooth for several years; leaves usually minutely serrate and hairy on 

 the margins, 2.5-4 cm. long; corolla little or not at all narrowed at the mouth 



when fully expanded 1. V. vacillans. 



Plants erect shrubs, commonly 1-2 meters high; bark early splitting and turning 

 brown; leaves usually entire and 4-7 cm. long; corolla distinctly narrowed at the 

 mouth, even when fully expanded. 

 Flower (from base of ovary to end of corolla) 5-7 mm. long. 



Fruit black; leaves pubescent beneath 2. V. atrococcum. 



Fruit blue; leaves glabrous beneath 3. V. caesariense. 



Flower 8-10 mm. long. Leaves glabrous and glaucous beneath; berry blue. 



4. V. corymbosum. 



