VOL. 2] Millikpn. Californian Polemoniaceae. 5 



knowledge of the probable incompleteness, and the possibility 

 of wrong judgment that the list of described species with which 

 this paper concludes is offered. The small number of species of 

 Phlox, Collomia, and Polemonium are comparatively well marked 

 and will cause little trouble to the California botanist; "except 

 that, among the Polemoniums, there is much confusion in 

 nomenclature concerning P. humile Willd. and P. humile var. pul- 

 chellum Gray, P. viscosum Nutt., and P. parvifolium Nutt. The 

 questions can only be settled by access to type specimens which 

 I have not thus far obtained, and the names are used which seem, 

 from a careful reading of the various references to the subject, to 

 come nearest to the truth. The differences between the Navar- 

 retia species are not great, but the small differences, referring 

 chiefly to foliage and corolla, are easily recognized except in a 

 few cases of hybrids. The subgenus Eugilia, of the genus Gilia, 

 includes an almost endless variety of forms, which are, with 

 much generalization, reduced to the species named below. 

 More light would doubtless be thrown upon their relationship 

 by a detailed study of geographical distribution and ecologic 



conditions. 



KEY TO THE GENERA. 



I. Calyx growing with the fruit, nearly distended by the capsule. 



A. Calyx wholly herbaceous. 1. POLEMONIUM. 



K. Calyx not wholly herbaceous. 2. COLLOMIA. 



II. Calyx growing after the flowering stage, always more or less distended 

 by the capsule, and usually ruptured by it. 



A. Stamens equally, or slightly unequally inserted; corolla variable. 



a. Calyx lobes unequal and pungent; leaves all alternate. 



3. NAVARRETIA. 



b. Calyx lobes equal, rarely pungent. 



1. Upper leaves alternate, variable. 4. GILIA. 



2. Leaves usually all opposite and palmately parted. 



5. LlNANTHUS. 



B. Stamens very unequally inserted ; corolla strictly salverform with 

 narrow orifice. 6. PHLOX. 



POLEMONIUM, L. 



Leaves alternate, pinnatifid; calyx entirely herbaceous, 

 accrescent, and not distended by the mature capsule; filaments 

 more or less declined and hairv at the base. 



