52. POLEMONIACE^E. 53. CONVOLVUIACE^E. 289 



Order LIL POLEMONIACE^E. 



Cal. inferior, 5-parted, persistent. Cor. hypogynous, regular, 

 5-lobed. Stam. 5, unequal, on the tube of the corolla. Ovary 

 3-celled. Stigmas 3-fid. Caps. 3-celled, 3-valved; valves 

 separating at the axis. No stipules. 



1. POLEMONIUM. Cal. 5-fid. Cor. rotate, with a short tube 

 and 5-lobed limb ; throat nearly closed by the dilated bases 

 of the filaments. 



1. POLEMO'NITJM Linn. Jacob's Ladder. 



1. P. cceruleum (L.) ; st. angular, 1. glabrous pinnate, leaflets 

 ovate-lanceolate pointed, panicle downy glandular. A B. 14. 

 St. 1 2 feet high, simple, hollow. L. alternate, leaflets 

 many. Fl. many, somewhat drooping, bright blue or white. 

 Bushy hilly places, rare. P. VII. E. S. 



Order LIU. CONVOLVULACE^E. 



Cal. inferior, of 5 persistent imbricate often unequal sepals. 

 Cor. hypogynous, regular, deciduous. Stam. 4 5, from near 

 the base of the corolla. Ovary of 2 4 cells, few-seeded, sur- 

 rounded by an angular hypogynous disk. Style 1, rarely 2. 

 Caps, with the valves separating from the edges of the diss'epi- 

 ments or bursting transversely. No stipules. 



* With leaves and leaflike cotyledons. JEstivation plaited. 



1. CONVOLVULUS. Cor. bellshaped, with 5 prominent plaits 

 and 5 shallow lobes. Style simple ; stigmas 2. Caps. 2 4- 

 celled ; cells 2-seeded. 



** Without leaves or cotyledons. ^Estivation imbricate. 



2. CUSCUTA. Cal. 4 5-cleft. Cor. roundish-urceolate or 

 bellshaped, 4 5-parted, with as many scales alternating 

 with the segments at the base within. Stam. 4 5. Styles 

 2, rarely 1. Caps, bursting transversely, 2-celled, 4-seeded. 



1. CONVOL'VULUS Linn. Bindweed. 

 * Bracts minute, distant from thejlower. 



1. C. arven'sis (L.); 1. ovate- or strapshaped-hastate, pe- 

 duncles mostly 1-flowered. E. B. 312. St. many, angular, 



