POLExMONIACE^. (POLEMONIUM FAMIIA'.) 240 



A. Stamens usually unequalli/ inserted: leaves mostly alternate, and pi'nnately 

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



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

 tjlandular plants. 



1. G. linearis, Gray. Braiuliing and in age »i)reatling, a span or two 

 high : flowers capitate-crowded and leafy-bracted : calyx obconirtd ; its loUs tri- 

 anffular-lanceolate : corolla from lilac-purple to noarly white, very blender. — 

 Proc. Am. Acad. xvii. 22-3. Collomia linearis, Xutt. From Colorado aud 

 Calif oruia northward throughout British America. 



2. G. gracilis, Hook. At length corymboscly nuuh branched and 

 spreading, 2 to 6 inches liigh : 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 wliolly destitute of sjiiracles I — (Jollomia gra- 

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

 British Columbia. 



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



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

 slightly if at all viscid plants. 



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

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

 cles: corolla ivhite, 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 fttt high, 

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

 mucronulate divisions : thyrsoid narrow panicle loose or interrupted ; the flout rs 

 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. From W. Nebraska to Oregon, and southward to Cali- 

 fornia, New Mexico, and W. Texas. 



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

 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 lui. 



rowly linear toflliform. 

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



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

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

 inflorescence, which is a close head or glomerulo subtended by an involurrr 

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

 form, white, pink, or yellow; the tube 3 or 4 lines h>ng and thrice the length 

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

 plains, from Colorado to Nf'vn<l:> and Orciron. In spring. 



