202 CONVOLVULUS FAMILY. 



G. tricolor, of California: with branching stem*, ahojit 1 hi<?h, scattered 

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

 ers panicled at the end of the branches, short funnel-form corolla witli lilao- 

 purple or whitish lobes, brown-purple throat, and yellow tube. 



G. capltata, 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. vV) 



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

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

 king named Poltmon.) Fl. early summer. 2/ 



P. r6ptans. Woods of Middle States, also cult. : smooth, Avith weak arid 

 uprcading (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. ceerilleum. Cult, in gardens from En., also rarely wild N. : smooth 

 or sometimes hairy; witli erect stem l-3 high, 0-21 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. COBJEA. (Named for one Col>o, 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 ovat ' ; dull purple or greenish corolla 2' or more long, long filaments 

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



33. CONVOLVULACE^I, CONVOLVULUS FAMILY. 



Twining, trailing, or rarely erect pla.its, (ours herbs,) commonly 

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

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

 separate stamens, corolla convolute or twi>ted in the bud, a 

 2-4-celled ovary and pod with only 1 or 2 ovules erect from the 

 base of each cell, becoming large .-ecds containing a curved or 

 roiled 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, Jig. 2~> - 28.) Calyx of 5 separate sepals. 



1. Style sini/Je and entire : stiyin is 1-3. 

 * C'ttyx n-tkal, 1. e. not tnclosid l>y (i p ilr of leafy bracts. 



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



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

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

 (Lesson*, p. 101, fig. 202, 203.) 



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



in thelmd. Stamens mostly included. Stigma capitate, commonly 2- 3-lobed. 

 Pod2-4-celted. 



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



included. Stigmas 2, linear. Pod 2-celled: cells '2-seeded. 

 * * Cl\j snrrnuntli-1/ <tnd enclosed bij a pair of Itirye leafy heurt-sha/ted bi'dcts. 



4. CALYSTKGIA. Corolla open funnel-form, the widi--<preadinp: border obscure- 



ly lobed or entire. Stamens included. Style hearing 2 linear or oblong 

 stigmas Pod 4-seeded. Peduncles 1-flowered. 



