POLEMONIACEAE 977 



b. Calyx-lobes less than y, as long as the tube. 19. P. maculata. 



B. Calyx-lobes bristle-like. ' 



Leaves conspicuously decurrent on the internodes : calyx-lobes about as 



long as the tube : corolla-tube pubescent. 20. P. acuminata. 



Leaves not decurrent on the internodes : calyx-lobes shorter than the 



tube : corolla-tube glabrous. 



Stems glabrous or puberulent : leaf-blades relatively narrow. 21. P. paniculate. 



Stems villous, and glandular above : leaf-blades relatively broad. 22. P. ampttfolia. 



1. Phlox Roemeriana Scheele. Annual, sparingly hirsute, or glabrate below. Stems 

 usually branched at the base ; branches erect or ascending, 0. 5-3 dm. tall : leaves mostly 

 alternate ; blades spatulate-oblong or lanceolate, 2-4 cm. long, mostly acute or acuminate, 

 sessile : calyx villous-hirsute, 8-10 mm. long ; lobes subulate, as long as the tube or 

 longer, spreading : corolla-tube glabrous, 1 cm. long ; limb about 2 cm. broad : capsules 

 5-6 mm. long. 



On high prairies, Texas. Spring. 



2. Phlox tnuis (A. Gray) E. Nelson. Annual, glabrous or slightly pubescent, not 

 villous. Stems 5-10 cm. long, erect or diffuse : leaves mostly opposite ; blades linear or 

 narrowly linear-lanceolate, 1-2.5 cm. long, acute : calyx 6-7 mm. long ; lobes subulate, 

 about as long as the tube : corolla lavender ; tube finely pubescent, surpassing the calyx ; 

 limb 12-15 mm. broad, the lobes rhombic-obovate, acute : capsules about 4 mm. long. 



In low grounds, eastern and southern Texas, Spring. 



3. Phlox Drummondii Hook. Annual, somewhat villous, at least below, and viscid. 

 Stems 1-3 dm. tall, often branched at the base and sometimes above : leaves alternate ; 

 blades narrowly oblong to lanceolate, or those at the base of the stem spatulate-oblanceo- 

 late. 1.5-4 cm. long, acute, sessile : calyx 8-9 mm. long ; lobes subulate : corolla laven- 

 der ; tube pubescent, surpassing the calyx ; limb 1.5-2 cm. broad, the lobes obovate, 

 abruptly pointed : capsules about 4 mm. long. 



In sand or sandy soil, Texas. Spring. 



4. Phlox villosissima (A. Gray) Small. Annual, conspicuously villous-hirsute 

 throughout. Stems 1-3 dm. tall, simple or much-branched : leaves mainly opposite ; 

 blades linear-lanceolate to almost linear, 2-6 cm. long, acute or somewhat acuminate, 

 bristly, sessile : calyx densely pubescent, 9-12 mm. long ; lobes lanceolate-subulate, nearly 

 erect, about as long as the tube : corolla pale lavender ; tube finely pubescent, somewhat 

 surpassing the calyx ; limb 2-2.5 cm. broad, the lobes orbicular-obovate or orbicular- 

 cuneate, often abruptly pointed : capsules 5-6 mm. long. [P. Drummondii var. villosissima 

 A. Gray.] 



In river valleys, southern Texas. Spring. 



5. Phlox aspera E. Nelson. Annual, pubescent with short rigid hairs. Stems 

 branched from the base ; branches 12-17 cm. tall, often with a few longer hairs mixed with 

 the puberulence : leaves opposite ; blades narrowly lanceolate to linear, 2-4.5 cm. long, 

 thick and firm : calyx, like the pedicels, glandular ; lobes twice as long as the tube, awn- 

 tipped : corolla violet ; tube glandular-pubescent, about twice as long as the calyx ; lobes 

 cuneate-obovate, about 11 mm. long, mucronate-acute : capsules 4-5 mm. long. 



In dry soil, southern Texas. Spring. 



6. Phlox r6ptans Michx. Perennial, often sparingly pubescent. Stems branched at 

 the base, the branches of 2 kinds ; sterile prostrate or creeping ; fertile erect or ascending : 

 leaves of 3 kinds, basal 4-10 cm. long, with spatulate or ovate blades and margined petioles, 

 those of the sterile shoots similar but smaller, those of the fertile stems usually oblong or 

 oblong-lanceolate : calyx 10-13 mm. long, sparingly pubescent ; lobes narrowly linear or 

 linear-subulate, about as long as the tube : corolla purple or violet ; tube 2-2.5 cm. long ; 

 limb 2.5-3 cm. broad ; lobes obovate or cuneate-obovate : capsules 2.5-3 mm. long. 



In open woods, Pennsylvania to Kentucky, south to Georgia and Alabama. Spring. 



7. Phlox divaricata L. Perennial, more or less densely viscid-hirsute. Stems erect 

 or ascending, 2-5 dm. long, usually tufted, producing decumbent or creeping shoots at the 

 base : leaves opposite ; blades oblong to lanceolate, or ovate-lanceolate, 1.5-5 cm. long, 

 usually acute, entire, sessile, the upper ones sometimes cordate ; those of the shoots often 

 longer, sometimes broadest above the middle, sessile : calyx 6-10 mm. long ; lobes linear- 

 subulate, curved at maturity : corolla lavander or bluish ; tube 1-1.5 cm. long ; limb 2.5-3 

 cm. broad ; lobes apiculate or notched : capsules subglobose, 4-5 mm. long. 



In damp woods, Ontario to Minnesota, south to Florida and Louisiana. Spring. 



8. Phlox amoena Sims. Perennial, villous or hirsute. Stems ascending or decum- 

 bent, 1-2.5 dm. long, often branched at the base : leaves opposite ; blades leathery, spatu- 

 late to oblong or linear, 1-4.5 cm. long, obtuse or merely acute, often erect or ascending, 

 sessile : corymbs compact, often congested : calyx bristly-pubescent, less than 1 cm. long ; 



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