Phlox longifolia, longleaf phlox

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Intermountain Flora
Perennial from an eventual taproot, but often branched and creeping below ground-level, (0.5) 1-4 dm tall, slender, but often woody toward the base, glabrous to more often strongly glandular (especially in the inflorescence) or hairy; leaves linear or lance-linear to lance-ovate or even ovate or elliptic, mostly 1-9 cm long and 1-6 mm wide; internodes well developed, the principal ones generally at least 5 mm long, often much longer; inflorescence leafy-bracteate at least below, rather loosely cymose, the sweet-scented flowers with well developed, slender pedicel; intercostal membranes of the calyx strongly and permanently bulged-carinate toward the base; corolla pink to white, the tube 10-30 (35) mm long, 1-3 times as long as the calyx, the lobes mostly 7-15 mm long, more or less obovate, entire or merely erose, ¼ to fully as long as the tube; filaments mostly attached above the middle of the corolla-tube, often some of the anthers partly exserted; style elongate, 6-25 mm long, several times as long as the linear stigmas.

Cronquist, A., Holmgren, A.H., Holmgren, N.H., Reveal, J.L., and Holmgren, P.K. (1984) "Intermountain Flora" pg.100, vol. 4, The New York Botanical Garden New York.