ORDER 92. POLEMONIACE^E. 567 



ccntsc axial, borne on each surface of the free, false dissepiment, seeds 

 many. Herbs with alternate, undivided Ivs., and axillary or terminal 

 cymes of blue fls. 



1 H. corymbosa Macbrido. Unarmed, sparingly hirsute above; Ivs. sessile, 

 lance-ovate; branchlets corymbed, each bearing u terminal flower ; sep. lanceolate. 

 acute, hispid ; cor. thrice longer thm> tlie eaiyx ; caps, roundish-ovoid, glabrous. 



-U Ponds in pine barrens, Ga. and P. Oar. (Bachman). Sts. 1 to 2f high. Lvs, 

 1' to 18 ' long, with downy veins and margins. Fls. showy, nearly bell-shaped, 

 1' broad, " azure with yellowish veins and 5 white spots near the base," (Elliott.) 

 Jn. Aug. 



2 H. quadrivalva "Walt. Spiny, more cr less hispid ; Ivs. lanceolate, petiolate, 

 very acute at both ends, entire ; cymes 4 to G-flowered, axillary, upper sessile, 

 lower pedunculate ; sepals ovate, acuminate, a little shorter than the corolla. 11 

 In stagnant waters, S. Car., Ga. to La. St. 2f high. Spines straight, slender, 

 axillary, 3 to 5" long. Lvs. 2 to 3' long. Cor. azure blue, 5 to 6" broad. 

 Caps, as large as a pea, with numerous minute sseds. Jl. Sept. 



3 H. ovata Nutt. With ovate-acuminate Ivs. and terminal clusters is found in W. 

 La. and Ark., probably not nativo within our limits. Rarely seen in gardens. 



ORDER XCII. POLEMONIACE^E. PIILOXWORTS. 



Herbs with alternate or opposite leaves and 5-parted, regular, showy flowers. 

 Corolla monopetalous, the lobes convolute, rarely imbricate in estivation. Sta- 

 mens 5, adherent to the corolla tube, and alternate with its lobes. Ovary 3-celled, 

 stigma 3-cleft ; capsule 3-celled, 3-valved, loculicidal. Seeds few or many, albumin- 

 ous, attached to a permanent columella. (Illustr. in Fig. 301.) 



Genera 17, species 104, chiefly N. American. They arc valued and cultivated only as orna- 

 mental plants. 



TRIIiES AND GENERA. 

 I. POLEMONIE.E. Sepals united at base. Lobes of the corolla convolute in bud. (a) 



a Corolla salver-form. Filaments unequal. Leaves entire PHLOX. 1 



a Corolla bell-form. Filaments equal. Leaves pinnate POLE.MONIUM. 2 



a Corolla funnel-form. Filaments equal. (Leaves pin nately dissected) GILIA. 9 



II. DIAPENSIE^E. Sepals distinct, oval. Lobes of corolla imbricated DIAPENSIA. 4 



1. PHLOX, L. PHLOX. LYCHNIDIA. (Gr. 0A6 a flower; from 

 the color and profusion of the flowers.) Calyx prismatic, deeply 5-cleft; 

 corolla salver-form, tho tube more or less curved; stamens very un- 

 equally inserted in the tube of the corolla above the middle ; capsule 

 3-celled, cells each 1-secdcd. A highly ornamental, North American 

 genus. Lvs. mostly opposite, sessile, simple, entire. Fls. in terminal, 

 cymes, corymbed or panicled. (Fig. 301.) 



* Lobes of the corolla rounded and entire at tho end. (1) 



J Panicle of cymes olilong or pyramidal, many-flowered Nos. 1, 54 

 Panicle of cymes corymbed, level-topped, flowers fewer. (2) 



% Plants glabrous. Calyx teeth shorter than its tubes Nos. 3, 4 



2 Plants "hairy. Calyx teetli attenuated, longer than the tube. (3) 



3 Leaves narrow, linear or nearly so Nos. 5, 6 



3 Leaves broad, ovate or lanceolate, etc Nos. 7, 8, |3., 9 



* Lobes of corolla notched or bifid at the end. Leaves distant Nos. 8,10 



Leaves imbi ieated No. 11 



1 P. paniculata L. Glabrous, erect ; Ivs. oblong or ovate-lanceolate, acuminate 

 at each end, or the upper abrupt at base, rough-edged, flat ; corymbs paniculate, 

 sub pyramidal, many-flowered ; cal. teeth setaceous-acuminate, nearly as long as the 

 tube; pet. roundish-obovate, entire. U This favorite is found native in woods 

 and river banks, W. States to Penn. and Car. St. 2 to 3f high, ending in a large, 

 oblong-pyramidal panicle of innumerable pink-colored, scentless flowers. Lvs. 3 



. to 5' by 9 to 16", lower ones distinctly petioled. Cor. tube a little curved, 12 to 

 15" long. Jl. Sept. f 



