262 CONVOLVULUS FAMILY. 



G. tricolor, of California: with branching stems, about 1° high, scattered 

 alternate leaves 2-3 times pinnately dissected into short linear divisions, flow- 

 ers panicled at the end of tire branches,- short funnel-form corolla with lilac- 

 purple orVhitish lobes, brown-purple throat, and yellow tube. (T) 



G. eapit^ta, of California and Oregon; l°-2° high, with alternate leaves 

 twice pinnately divided into small linear or thread-like leaflets or lobes, and 

 numerous small blue flowers crowded in heads at the end of naked branches ; 

 the corolla narrow funnel-form with lanceolate lobes. (T) 



3. POLEMONIUM, GREEK VALERIAN, JACOB'S LADDER. 



(Ancient name, from the Greek word for war, or in honor of a philosopher or 

 king named Polemon.) Fl. early summer. ^ 



P. r6ptans. Woods of Middle States, also cult. : smooth, with weak and 

 spreading (but never creeping) stems 6' -10' long, 7-11 lance-ovate or oblong 

 leaflets, small corymbs of nodding light blue flowers, and stamens and style not 

 longer than the corolla. 



P. caeruleum. Cult, in gardens from Eu., also rarely wild N. : smooth 

 or sometimes hairy ; with erect stem l°-3° high, 9-21 mostly lanceolate and 

 crowded leaflets, clusters of bright blue flowers collected in a long panicle, and 

 stamens and style longer than the lobes of the corolla, which is 1' broad. 



4. COB^A. (Named for one Cobo, a Spanish priest in Mexico, from which 

 country the common species was introduced into cultivation.) 2/ 



C. scandens. Smooth, tall-climbing by its much branching tendrils ; 

 leaflets ovate ; dull purple or greenish corolla 2' or more long, long filaments 

 coihng spirally when old : fl. all summer, usually cult, as an annual. 



83. CONVOLVULACE^, CONVOLVULUS FAMILY. 



Twining, trailing, or rarely erect plants, (ours herbs,) commonly 

 with some milky juice, alternate leaves, no stipules ; regular mono- 

 petalous flowers with 5 (rarely 4,) imbricated sepals, as muny 

 separate stamens, corolla convolute or twisted in the bud, a 

 2 - 4-celled ovarj'^ and pod with only 1 or 2 ovules erect from the 

 base of each cell, becoming large seeds, containing a curved or 

 coiled conspicuous embryo in some mucilaginous (or when dry, 

 harder) albumen. 



I. CONVOLVULUS FAMILY proper ; with ordinary foli- 

 age, axillary peduncles bearing one or more usually showy flowers, 

 and embryo with broad leaf-like cotyledons folded and crumpled in 

 the seed. (Lessons, p. 14, fig. 25 - 28.) Calyx of 5 separate sepals. 



§ 1. Style single and entii'e : stigmas 1-3. 

 * Calyx naked, i. e. not enclosed by a pair of huftj bracts. 



1. QUAMOCLIT. Corolla nearly salver-shaped or trumpet-shaped, with a long 



tube, the border not twisted in the bud. Stamens and stvle commonly pro- 

 truded. Stigma capitate, more or less 2-lobed. Pod 4-celled: cells 1-s'eeded. 

 (Lessons, p. 101, fig. 202, 203.) 



2. IPUJUEA. Corolla various, more commonly funnel-form, the border twisted 



ill tlie bud. Stamens mostly included. Stigma capitate, commonly 2 - 3-lobed. 

 roa2-4-cencd. 



3. CONVOLVULUS. Corolla open funnel-form or almost bell-shaped. Stamens 



included. Stigmas 2, linear. Pod2-celled: cells 2-seeded. 

 * « Calyx surrounded and enclosed by a pair of large leafy heart-shaped bracts. 



4. CALYSTEGIA. Corolla open funnel-form, the wide-spreading border obscure- 



ly lobed or entire. Staniens ini'luJed. Style bearing 2 linear or oblong 

 stigmas. Pod 4-seeded. Peduncles 1-tiowored. 



