688 POLEMONIACEAE 



Calyx-lobes much exceeding the tube in length; plant usually erect, simple below; corolla 



tube 1 mm. wide or more; Umb 3^ mm. wide. 1. M. gracilis. 



Calyx-lobes not longer than the tube; plant low, diffusely branched from near the base; 



corolla-tube less than 1 mm. wide; limb 1-2.5 mm. wide. 

 Plant 1.5-2 dm. high; leaves except the lower ones lanceolate or linear-laijceolate, 



mostly acute; corolla-tube longer than the calyx. 2. M. humilis. 



Plant less than 1 dm. high; leaves, except the basal ones, oblong or linear, obtuse, 

 the basal ones spatulate; corolla-tube scarcely exceeding the calyx. 



3. AJT. micrantha. 



1. M, gracilis (Dougl.) Greene. Stem erect or rarely decumbent (M. dif- 

 fusa Heller), puberulent and glandular above, 1^ dm. high; basal leaves spatu- 

 late, the upper stem-leaves Hnear or hnear-lanceolate, acute, 2-6 cm. long; calyx 

 tubular, glandular-pubescent, 7-10 mm. long; corolla 10-14 mm. long; tube 

 yellowish; limb purplish or violet. G, gracilis Hook. Hills and valleys: B.C.— 

 Mont.— Wyo.— Calif. Plain— SuhmonL My-Jl. 



2. M. humilis (Dougl.) Greene. Stem puberulent and more or less glandu- 

 lar; lower leaves oblanceolate or spatulate; calyx tubular, 7-9 mm. long; lobes 

 subulate; corolla 8-10 mm. long; tube white; limb purplish or violet, sometimes 

 white. Collomia humilis Dougl. Dry plains and sandy soil: B.C. — Mont.— 

 Colo. — Calif. Plain— Submont. My-Jl, 



3. M» micrantha (Kellogg) Greene. Stem glandular and puberulent; 

 lower leaves 1-2 cm. long, puberulent; calyx tubular, 4-5 mm. long, puberulent; 

 teeth subulate; corolla 5-7 mm. long; tube white; limb white, rose-colored, or 

 violet. Collomia micrantha Kellogg. Dry or sandy soil: Neb.—Colo. — Ariz. — 

 c Calif. Son. — Mont. Ap-Je. 



5. WELWITSCHIA Reichenb. 



Annual herbs, with alternate entire or pinnatifid floccose leaves. Flowers 

 perfect in dense heads; bracts conspicuously long-villous. Calyx densely woolly; 

 lobes acerose-tipped; tube ruptured by the fruit. Corolla salver-shaped, with a 

 funnelform open throat. Stamens 5; filaments adnate to the whole tube of the 

 corolla, exserted; anthers deeply sagittate. Seed usually mucilaginous and with 

 spiracles when wetted. [Huegelia Benth., not Reichenb.] 



Corolla-lobes much shorter than the tube. 



Plant erect; heads acute at the base; bracts ascendine. 



Bracts not dilated at the base. 1. W. WilcoxiL 



Bracts somewhat dilated at the base. 2. W. fiUfolia. 



Plant diffuse; heads rounded at the base; bracts spreadinflr. 3. IT. diffusa. 



Corolla-lobes scarcely shorter than the tube. 4. W. floccosa. 



1. W. Wilcoxii (A. Nels.) Rydb. Stem erect, with erect or ascending 

 branches, lanate, 1-2 dm. high; leaves 3-parted with hnear, pungently-tipped 

 lobes, floccose; bracts 5-parted; calyx-lobes unequal, subulate; corolla about 1 

 cm. long, tubular-funnelform, white; tube scarcely exceeding the calyx. Cilia 

 Wilcoxii K. Nels. Dry soil: Ida.— Ore. Son. Jl. 



2. W. filifolia (Nutt.) Rydb: Stem 1-2 dm. high, sparingly floccose; leaves 

 filiform, simple, or 3-parted into filiform divisions, cuspidate; bracts 2-5-cleft, 

 vAth. a hyaline base, somewhat arcuate; calyx-lobes subulate, unequal, shorter 

 than the tube; corolla Ught blue, scarcely longer than the calyx. G. filifolia 

 Nutt. Plains: Wash.— Utah— N.M.— Calif. Ap-Jl. 



3. W. diffusa (A, Gray) Rydb. Stem 1-10 cm. high, diffusely branched 

 near the base, sparingly floccose; leaves spreading, 3-parted into spreading fili- 

 form lobes, or some entire; bracts 5-parted ;- calyx-lobes subulate, unequal; cor- 

 olla about 12 mm. long; lobes about half as long as the tube. G. filifolia diffusa 

 A. Gray. Plains and dry places: Tex.— s Utah— Calif. Son. Ap-Je. 



4. W. floccosa (A. Gray) Rydb. Stem 1-3 dm. high, branched, more or less 

 floccose or glabrate in age; leaves 3-parted or entire, fiUform or with fihform lobes, 

 floccose; bracts much longer than the heads, divergent; calyx-teeth subulate; 

 corolla violet blue to white, about 15 mm. long; hmb nearly 1 cm. vnAe. G. floccosa 

 A. Gray. Plains: Wash.— Utah— Ariz.— Cahf. Son. My-Au. 



