236 POLEMONIACEAE. 



3. PHACELIA Juss. Annual, biennial, or perennial herbs. Leaf -blades 

 toothed or dissected. Flowers in scorpioid racemes or cymes. Calyx slightly 

 accrescent. Corolla white or variously colored: lobes entire to fimbriate. 

 Filaments not dilated at the base. Styles partly united. — Spr. 



Corolla-lobes entire : filaments longer than the corolla : capsules 2.5-3 mm. long. 



1. P. duMa. 

 Corolla-lobes fimbriate : filaments about as long as the corolla : cap- 

 sules about 4 mm. long. 2. P. Purshii. 



1. P. dubia (L.) Small. Plants 0.5—1: dm. tall, often diffuse, strigillose, as 

 well as glandular: stem-leaves with 3-5 short broad lobes: calyx-lobes narrowly 

 oblong or nearly so, 3-4 mm. long: corolla mainly pale-lilac, 5-6 mm. long; 

 appendages obsolete: stamens longer than the corolla: ovary and style-base 

 pubescent : capsules 2. .5-3 mm. long. — Susquehanna valley. Common, on rich 

 hillsides and in thickets. — Schists. 



2. P. Purshii Buckl. Plants 1-3 dm. tall, with rather stiff stems: stem-leaves 

 with 5-9 lanceolate or oblong lobes: calyx-lobes linear to oblong-spatulate, 4-5 

 mm. long : corolla light-blue or rose-colored, 6-7 mm. long ; lobes short- 

 fimbriate; appendages manifest: filaments about as long as the corolla: 

 capsules about 4 mm. long. — ■ Susquehanna valley. Eare, near Safe Harbor. — 

 Schists. 



Family 4. POLEMONIACEAE. Phlox Family. 



Annual or perennial herbs, or woody plants. Leaves opposite or alter- 

 nate : blades various. Flowers perfect, in variously disposed cymes. 

 Calyx of 5 partly united sepals. Corolla of 5 partly nnited petals, mostly 

 rotate, funnelform, or salverform. Andi'oecium of 5 stamens, partly 

 adnate to the corolla. Gynoecium 3-carpellary. Frnit a capsule mostly 

 included in the calyx. 



Calyx not accrescent, the tube distended or ruptured by the capsule : stamens not 

 declined. 1. Phlox. 



Calyx accrescent, the tube not distended by the capsule : sta- 

 mens declined. 2. Polesionidm. 



1. PHLOX L. Herbaceous or woody, erect, diffuse, or creeping plants. 

 Leaves mainly opposite: blades entire. Corolla salverform. Filaments un- 

 equally adnate to the corolla-tube. 



Calyx-lobes fully as long as the tube. 



Plants with prostrate sterile shoots : leaf-blades obtuse, acute, or acutish. 



1. /'. diraricata. 

 Plants without prostrate sterile shoots : leaf-blades acuminate. 2. P. pilosa. 

 Calyx-lobes shorter than the tube. 



Shrubby plants with prostrate stems and branches, in dense 



mats : leaves clustered ; blades very narrow. 3. P. siihnlata. 



Herbaceous plants with erect stems and branches, not 

 matted : leaves not clustered ; blades broad. 

 Calyx-lobes lanceolate or triangular-l.nnceolate. 4. P. maculata. 



Calyx-lobes subulate and awn-tipped. 5. P. paniculata. 



1. P. divaricata L. Leaf-blades oblong to lanceolate, or ovate-lanceolate, 1.5-5 

 cm. long, 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 lavender or bluish; 

 tube 1-1.5 em. long; limb 2.5-3 cm. broad, the lobes apiculate or notched: cap- 

 sules subglobose, 4-5 mm. long. — Common, in rich woods. — Spr. — Blue- 

 phlox. 



2. P. pilosa L. Leaf-blades linear to narrowly lanceolate, 3-8 cm. long, 

 attenuate, sessile: corymbs becoming lax: calyx about 1 cm. long; lobes subu- 

 late-setaceous, as long as the tube or longer: corolla pink-purple or white; 



