370 POLEMONIACE.E. (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. Franklinii, 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, dense, 

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

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

 Koyale ; thence northward and westward. 



5. HYDROLEA, L. Htdrolea. 



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- 

 centa 1 , thin-walled, 2 - 4-valved or bursting irregularly. Seeds minute, striate- 

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

 (whence the name, from v8a>p, water), with entire leaves, often having spines 

 in their axils, and clustered blue flowers. 



1. H. affinis, 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. POLEMONIACEiE. (Polemonium Family.) 



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

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

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

 many-seeded ; the valves usually breaking aicay 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. POL.EMONIEJE. Calyx 5-cleft. Corolla convolute in the bud. Filaments 

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

 wise. Flowers cymose-panicled or clustered. 



1. Polemonium. 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. DIAPENSIE.E. Calyx of 5 sepals. Corolla imbricated in the bud, and 

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



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



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



