398 



POLEMONIACEAE (PHLOX FAMILY) 



limb of short obtuse lobes. Stamens unequal and unequally inserted on the 

 tube of the corolla. Capsule narrowed at base. Seeds usually 1 in each cell, 

 mucilaginous when wetted, and emitting spiracles. 



Flowers in terminal clusters 



Flowers solitary in the uppermost axils 



1. C. linearis. 



2. C. tenella. 



1. Collomia linearis Nutt. Gen. 1: 126. 1818. Stems simple or branching 

 above, sometimes in age widely so, 1-3 dm. high: flowers capitate-crowded 

 and leafy-bracted : calyx obconical; the lobes triangular-lanceolate: corolla 

 from lilac-purple to nearly white, very slender, tubular-funnelform, the tube 

 minutely pubescent: capsule triangular-obcordate. Very common in moist 

 sandy soils in our range. 



2. Collomia tenella Gray, Proc. Am. Acad. 8: 259. 1870. Viscid-puberu- 

 lent, very slender, 5-12 cm. high, simple or laxly branched above: leaves 

 entire, linear, obtuse, attenuate at base, the lowest opposite: flowers solitary 

 in the axils, remote, nearly sessile: calyx obconic, about 4 mm. long, the lobes 

 short-triangular, shorter than the broadly turbinate tube: corolla purplish, 

 about 8 mm. long, narrow, salverform: ovules solitary. Mountains of Utah 

 and Nevada. 



4. GILIA Ruiz & Pav. 



Annual, biennial, or perennial herbs, with alternate or opposite, entire or 

 divided leaves. Flowers scattered or congested in heads or thyrsiform pan- 

 icles. Calyx tubular or campanulate, at length split by the enlarging capsule. 

 Corolla tubular or funnelform, with an open funnelform throat. Stamens un- 

 equally or equally inserted. Seeds usually developing spirally- twisted threads 

 when wetted. 



Key to the Sections 



Leaves alternate, the lowest sometimes opposite. 



Flowers scattering-solitary, in corymbs, or in corymbose- 

 panicles. 



Annuals, with straight embryo (see also nos. 7 and 8); 

 the seed-coats often developing mucilage and emit- 

 ting spiral threads if wetted. 



Ovules solitary in each cell I. PHLOGASTRUM. 



Ovules 2-several in each cell II. EUGILIA. 



Biennials or perennials (except nos. 7 and 8), with straight 

 embryo; the seedcoats developing mucilage and emit- 

 ting spiral threads if wetted III. IPOMOPSIS. 



Flowers congested in capitate or spicate inflorescences; 

 embryo broadly curved; calyx and bracts viscid pubes- 

 cent; seed-coats developing mucilage and emitting 



spiral threads if wetted IV. ELAPHOCERA. 



Leaves opposite or rarely alternate and then palmately 3-7- 



cleft or parted. 

 Perennials .......... V. 



Annuals, with funnelform corolla ..... VI. 



I. PHLOGASTRUM. Leaves entire or divided; flowers solitary or 



loosely corymbed. 

 Corolla scarcely longer than the calyx, salverform. 



Stamens unequally inserted ....... 



Stamens equally inserted ....... 



Corolla twice as long as the calyx ...... 



II. EUGILIA. -Leaves pinnatifid or bipinnatifid, rarely nearly en- 



tire; flowers scattered-paniculate. 

 Seeds unchanged if wetted. ....... 



Seeds emitting spiral threads if wetted ..... 



III. IPOMOP3IS. Biennials, perennials, or rarely annuals; stems 

 usually tall; corolla usually well exserted from the calyx. 



Leafy throughout. 



Corolla 10-12 mm. long 



Corolla 20-50 mm. long. 



Annuals; c;ipsulr much longer than the calyx. 



Corolla more than 3 cm. long ...... 



[la less than 3 cm. long ...... 



Biennials; capsule not longer than the calyx. 



Flowers re: 1 or roseate ....... 



Flowers white . 



LEPTODACTYLON. 

 DACTYLOPHYLLUM. 



1. G. micrantha. 



2. G. Tweedyi. 



3. G. tenerrima. 



4. G. leptomeria. 



5. G. inconspicua. 



6. G. polyantha. 



7. G. longiflora. 



8. G. laxiflora. 



9. G. aggregate. 

 10. G. attenuata. 



