\ ERICACEAE. 275 



triangular-lanceolate; calyx-lobes deltoid-ovate, scarcely longer than broad; 

 petals cream-colored, obovate; style deflexed. 



In dry soil, in open pine woods. Allied to P. denlata and P. picta is a 

 group of puzzling forms which represent different degrees of saprophytism 

 rather than specific distinctions. P. pallida Greene has very glaucous leaves 

 and usually grows in dense shade. P. sparsifolia Suksdorf and P. dentata 

 integra Gray are apparently the same as P. pallida but with the leaves smaller 

 in size and number or even reduced to scales. 



P. septentrionalis Andres may be a good species distinguished by having 

 deltoid-lanceolate caly.x-lobes longer than broad. P. blanda .Andres and 

 P. conardiana Andres are apparently not difTerent from P. septentrionalis. 

 There is need of much field study and more copious material of all of these 

 forms before their real relationships can be made clear. 



Pyrola bracteata Hook. Leaves all basal, green, coriaceous, ovate, acute, 

 rounded at base, crenulate, 3-6 cm. long; petioles margined, as long as the 

 blades; scapes 20-40 cm. high, with several brownish scarious lanceolate 

 bracts; racemes many-flowered; calyx-lobes triangular-lanceolate, acute, about 

 half as long as the petals; corolla irregular, dull-red, about 1 cm. broad; anthers 

 slightly constricted at apex; style declined, with a collar-like ring at the base of 

 the stigma. 



Coniferous woods, common. 



Pyrola elata Nutt. Very similar to P. bracteata; but leaves broadly ob- 

 ovate or orbicular, obtuse, thinner, not shiny; flowers paler. 



In wet places in woods. Probably not distinct from the more eastern 

 P. uliginosa Torr. & Gr. 



Family 75. ERICACEAE. Heather Family. 



Perennial herbs or shrubs; leaves simple, commonly alternate, 

 articulated to the stem, without stipules; flowers regular, or 

 nearly so; corolla generally gamopetalous, 4- or 5-lobed; stamens 

 as many or twice as many as the corolla lobes, hypogynous; style 

 single; ovary with as many cells as the corolla-lobes, or rarely 

 less; seeds small; endosperm fleshy. 



Calyx-tube adherent to the ovary. 



Erect shrubs; corolla cylindric or urn-shaped. 375. Vaccinium, 276. 

 Trailing vines; corolla deeply 4-cIeft, the 



lobes spreading. 376. OxYCOCCUS, 277. 



Calyx-tube free from the ovary. 

 Fruit a berry or drupe. 



Calyx becoming large and fleshy; bark 



not red. 377. Gaultheri.\, 278. 



Calyx small; bark red. 



Tree; fruit a many-seeded berry. 378. Arbutus, 278. 



Shrub; fruit a 5-10-seeded drupe. 379. Arctostaphylos, 279. 



Fruit a dry capsule. 



Anther-cells each tipped with a recurved 

 awn. 

 Corolla 5-lobed; peduncles lateral. 380. Cassiope, 280. 



Corolla 5-cleft; peduncles terminal. 381. Harrimanella, 280. 

 Anther-cells not appendaged. 



Petals not united; bracts deciduous. 



