POLEMONIACEAE. 197 



Ovary and capsule pointed. C. indecora. 

 Ovary and capsule globose. 



Flowers in dense clusters; style shorter than the ovary. C. arvensis. 

 Flowers in loose clusters; styles longer than the ovary. 



Stems coarse; calyx-lobes obtuse. C. cephalanlhi. 



Stems fine; calyx-lobes acute. C. californica. 



Cuscuta indecora Chois. Stems coarse; flowers 3-5 mm. long, pedicelled, 

 in loose clusters; calyx rather fleshy, the lobes acute; corolla lobes ovate- 

 lanceolate, acute, as long as the tube, spreading, minutely crenulate and papil- 

 lose; scales large, broadly oval, deeply fringed; seeds about 4. Mostly on 

 leguminous and composite plants. Waitsburg, Horner. 



Cuscuta arvensis Beyrich. Stems fine, pale yellow; flowers 1.5-2 mm. long, 

 in dense clusters; calyx-lobes obtuse, broad; corolla-lobes ovate-lanceolate, 

 acuminate, slightly longer than the tube; scales large, oval, fringed; seeds 4. 

 On alfalfa, Waitsburg, Horner. 



Cuscuta cephalanthi Engelm. Stems coarse, dark yellow; flowers 2 mm. 

 long, on thick pedicels, in loose clusters; calyx-lobes oblong, obtuse, about as 

 long as the tube; corolla lobes oblong, obtuse, shorter than the tube; scales 

 fringed. Climbing high on shrubs along streams. 



Cuscuta californica Chois. Stems fine, pale yellow; flowers 2.5-3 mm. long, 

 on slender pedicels, in loose clusters; corolla lobes acute, lanceolate, about as 

 long as the tube; scales wanting. On low shrubs, in dry places. 



Family 76. POLEMONIACEAE. 



Herbs; leaves alternate or opposite, simple or divided, without 

 stipules; flowers regular, perfect, 5-mercus, except the pistils; 

 corolla gamopetalous, convolute in the bud; lobes not plaited; 

 stamens epipetalous, alternate with the corolla-lobes, distinct; 

 style 3-lobed; ovary 3-celled; capsule 3-celled, 3-valved, the 

 valves usually breaking away from the triangular central column ; 

 seeds few-many; seed-coats when wetted commonly becoming 

 mucilaginous and developing spiricles. 



Calyx distended and at length burst by the capsule. 

 Corolla large, salverform; leaves all opposite, 



entire. 291. Phlox, 197. 



Corolla usually small, tubular, funnelform or sal- 

 verform; leaves mostly alternate, usually not 

 entire. 292. Gilia, 198. 



Calyx not distended nor burst by the capsule.^ 



Corolla rotate or campanulate; leaves pinnate, 



the leaflets entire. 293. Polemonium, 200. 



Corolla tubular. 



Calyx-lobes spine-tipped; leaves pinnatifid. 294. Navarretia, 201. 

 Calyx-lobes not spine-tipped; leaves entire. 295. Collomia, 201. 



291. PHLOX. 



Perennial herbs or half shrubby plants; leaves opposite, sessile, 

 entire; flowers in cymes, terminal or in the upper axils, mostly 



