ERlCACE.i:. (heath FAMILY.) 313 



6. V. vacillans, Solander, (Low Blueberry.) Lotv (1-2|° high), 

 glabrous, with yellowish-green branchlets; leaves obovate or o?;«/, veri/ pale or 

 dull, glaucous, at least underneath, minutely ciliolate-serrulate or entire ; co- 

 rolla between bell-shaped and cyliudraceous, the mouth somewhat contracted. 



— Dry places, especially in sandy soil. New Eng. to Mich, and Iowa, south to 

 N. C. and ]\Io. — Berries ripening later than those of n. 4. 



7. V. corymbosum, L. (Com>io> or Swamp-Blueberry.) Tall (5- 

 10° high); leaves ovate, oval, oblong, or elliptical-lanceolate; corolla varying 

 from turgid-ovate and cylindrical-urn-shaped to oblong-cylindrical, 3 - 4" long. 

 ■ — Swamps and low thickets, throughout our range and southward. This yields 

 the common blueberrij or blue huckleberri/ of the latter part of the season. The 

 typical form has leaves with naked entire margins, and may be pubescent or 

 glabrous (var. glabrum, Gray, Man.) Numerous gradations unite the fol- 

 lowing varieties : — 



Var. ambenum, Gray. Leaves bristly-ciliate, shining above, green both 

 sides, beneath somewhat pubescent on the veins. — Middle Atlantic States. 



Var. pallidum, Gray. Leaves mostly glabrous, pale or whitish, glaucous 

 especially underneath, serrulate with bristly teeth. — Common in the Alle- 

 ghanies southward, mostly on the higher ridges. 



Var. atrococeum, Gray. The most distinct form ; leaves entire, downy 

 or woolly underneath even when old, as also the branchlets ; berries smaller, 

 black, without bloom. — New Eng. to Penn. 



§3. VACCINIUM proper. (Bilberries.) Corolla ovate to globular, A- b- 

 toothed ; Jilaments glabrous; anthers 2-awned on the back, included; berry 

 4~5-celled ; leaves deciduous ; flowers on drooping pedicels, solitary or few 

 together, appearing with or after the leaves ; mostly glabrous. 

 * Parts of the flower mostly in fours; stamens 8. 



8. V. Tlliginosum, L. (Bog Bilberry.) Low and spreading (4' -2'' 

 high), tufted ; leaves entire, dull, obovate or oblong, pale and slightly pubes- 

 cent underneath; flowers single or 2-3 together from a scaly bud, almost 

 sessile ; corolla short, urn-shaped ; berries black with a bloom, sweet. — Alpine 

 tops of the high mountains of N. Eng, and N. Y., shore of L. Superior, and 

 northwestward. (Eu.) 



* * Parts of the flower in flves ; stamens 10; leaves membranaceous ; flowers 

 solitary on short axillary peduncles, nodding. 



9. V. CSespitoSUm, Michx. Dwarf (3-6' high), tufted, leaves obovate, 

 narrowed at the base, smooth and shining, serrate : corolla oblong, slightly urn- 

 shaped; berries blue. — Alpine region of the White Mts.,and high northward. 



— Var. cuneif6lil"m, Nutt., is a foot high or less, bushy, with cuneate-spata- 

 late leaves rounded at the apex, passing in one form to spatulate-lanceolate 

 and acute. — Shores of L. Superior and westward. 



10. V. myrtilloides, Hook. More erect, 1-5° high; branchlets some- 

 what angled ; leaves mostly ovate and acute or pointed, sharply and closely 

 serrulate, bright green, nearly smooth; border of the calyx almost entire; co- 

 rolla depressed-globular, rather large ; berries large, black, rather acid. — Damp 

 woods, shores of L. Superior, and northwestward. May June. — Pedicels 3 - 

 6" long, drooping in flower, erect in fruit. 



