POLEMONIACE^E. (POLEMONIUM FAMILY.) 249 



A. Stamens usually unequally inserted: leaves mostly alternate, and pinnately 

 incised or divided: seed-coat usually developing spiral threads when wetted. 



* Leaves sessile and entire : ovules solitary : more or less viscid-pubescent or 

 glandular plants. 



1. G. linearis, Gray. Branching and in age spreading, a span or two 

 high : flowers capitate-crowded and leafy-bracted : calyx obconicul ; its lobes tri- 

 angular-lanceolate : corolla from lilac-purple to nearly white, very slender. — 

 Proc. Am. Acad. xvii. 223. Collomia linearis, Nutt. From Colorado and 

 California northward throughout British America. 



2. G. gracilis, Hook. At length corymbosely much branched and 

 spreading, 2 to 6 inches high : leaves lanceolate or linear or the lowest oval 

 or obovate : flowers rather loosely cymose or scattered : calyx rounded at base ; 

 its lobes subulate-linear : corolla purple or violet ; its narrow tube yellowish : 

 the mucilage-cells of the seed-coat wholly destitute of spiracles ! — Collomia gra- 

 cilis, Dougl. Prom Arizona and New Mexico northward through Colorado to 

 British Columbia. 



* * Cauline leaves very numerous, simply pinnately parted into narrowly linear 



divisions : inflorescence thyrsiform or panicled : ovules numerous in each cell : 

 slightly if at all viscid plants. 



3. G. longiflor a, Don. Glabrous, loosely paniculate-branched : divisions 

 of the leaves long and slender : flowers somewhat corymbose on slender pedun- 

 cles: corolla white, strictly salverform, showy; the tube often 1£ inches long, 

 with narrow orifice ; lobes orbicular or ovate. — Collomia longiflora, Gray. W. 

 Nebraska and Colorado to Texas and Arizona. 



4. G. aggregata, Spreng. Somewhat, pubescent: stems 2 to 4 feet high, 

 leafy, sometimes loosely branching : leaves thickish, with narrowly linear 

 mucronulate divisions : thyrsoid narrow panicle hose or interrupted; the flowers 

 sessile in small mostly short-pedunculate clusters : calyx commonly glandular : 

 corolla from scarlet to pink-red (rarely white), with narrow tube; the lobes ovate 

 or lanceolate, acute or acuminate, widely spreading, soon recurved. — Collomia 

 aggregata, Porter. Prom "W. Nebraska to Oregon, and southward to Cali- 

 fornia, New Mexico, and W. Texas. 



Var. attenuata, Gray. Corolla-lobes lanceolate, tapering gradually froir 

 the very base into a slender acumination : calyx-lobes equally slender. — Synopt 

 Fl. ii. 145. Middle Park, Colorado. 



B. Stamens equally inserted : seed-coat sometimes developing spiral threads. 



* Leaves either opposite or palmately divided, or both; their divisions from na\ 



rowly linear to filiform. 

 •4- Leaves opposite : flowers small, in a head or dense cluster. 



5. G. nudlcaulis, Gray. Very glabrous, an inch to a span high, at 

 length branching from the base : stem leafless from the cotyledons up to the 

 inflorescence, which is a close head or glomerule subtended by an involucre 

 of several entire ovate-lanceolate or lanceolate foliaceous bracts : corolla salver- 

 form, white, pink, or yellow ; the tube 3 or 4 lines long and thrice the length 

 of the calyx: ovules 10 to 16 in each cell. — Proc. Am. Acad. viii. 266. Sandy 

 plains, from Colorado to Nevada and Oregon. In spring. 



