370 POLEMONIACE^. (POLEMONIUM FAMILY.) 



longer than the oblong calyx-lobes; corolla bluish-white (3" -4" broad) ; pod 

 ftw-seeded. — Shaded banks, S. Penn. to Virginia and southward. April- June. 

 5. P. Pranklinii, Gray. Soft-hairy; stem erect (6'- 15' high), rather 

 stout ; leaves pinnately parted into many lanceolate or oblong-linear lobes, 

 which are crowded and often cut-toothed or pinnatifid ; racemes short, demise, 

 crowded into an oblong spike ; calyx-lobes linear ; corolla blue ; pod many-seeded. 

 (Eutoca Franklinii, R. Br.) — Shores of Lake Superior, especially on Isle 

 Eoyale ; thence northward and westward. 



5. HYDROLEA, L. Htdholea. 



Calyx 5-parted. Corolla short-campanulate or almost wheel-shaped, .5-cleft. 

 Filaments dilated at the base. Styles 2, distinct. Pod globular, 2-celled, and 

 the cells often partly divided into 2 by the projection of the many-seeded pla- 

 centEe, thin-walled, 2-4-valved or bursting irregularly. Seeds minute, striate- 

 ribbed. — Herbs or scarcely shrubby plants, growing in water or ivet places 

 (whence the name, from vhap, water), with entire leaves, often having spines 

 in their axils, and clustered blue flowers. 



1. H. a£9.Ilis, n. sp. Glabrous throughout ; stem ascending from a creep- 

 ing base, armed with small axillary spines ; leaves lanceolate, tapering into a 

 very short petiole; flowers in small axillary leafy-bracted clusters; divisions of 

 the calyx lance-ovate, equalling the corolla and the irregularly-bursting globose 

 pod. — Banks of the Ohio in S. Illinois, Dr. Vasey (and of the Missisippi at 

 Memphis, A. Fendler : also E. Texas, C. Wright: in addenda to ed. 2, referred 

 to H. quadrivalvis, Walt., of the Southeastern States, from which it is dis- 

 tinguished by the smoothness and the broader sepals. 



Order 74. POI,EMO]VIACEjE. (PoLEMONitiJi Family.) 



Herbs, with alternate or opposite leaves, regular 5-merous and 5-androus 

 flowers, the lobes of the corolla convolute (in one tribe imbricated') in the bud, 

 a S-celled ovary and 3-lobed style ; the pod 3-celled, 3-valved, loculicidal,few- 

 many-seeded ; the valves usually breaking away from the triangular central 

 column. — Seeds amphitropous, the coat frequently mucilaginous when 

 moistened and emitting spiral threads. Embryo straight in the axis of 

 copious albumen. Calyx persistent, usually imbricated. Corolla with a 

 5-parted border. Anthers introrse. (Insipid and innocent plants ; many 

 are ornamental in cultivation.) 



Tribe I. POLEMONIEa;. Calyx 5-cleft. Corolla convolute in the bud. Filaments 

 flliform. inserted on the tube of the corolla : cells of the anther parallel, opening length- 

 wise. Flowers cymose-panicled or clustered. 



1. Poleinonlnm. Calyx and corolla open-bell-shaped. Filaments slender, equal. 



2. Phlox. Calyx narrow. Corolla salver-shaped, with a long tube, including the unequally 



inserted filaments. 



Tribe II. DIAPENSIB^. Calyx of 5 sepals. Corolla imbricated in the bud, and 

 with the broad and flat filaments in the sinuses. Anthers opening transversely. 



3. Dlapensla. Anther-cells pointless, opening by an obliquely transverse line. 



4- Pyxldauthera. Anther-cells awn-pointed underneath, opening straight across. 



