STANDLEY — FLORA OF GLACIER PARK. 331 



2. SALSOLA L. 



1 Salsola pestifer A. Nels. Russian thistle. A few plants in waste ground 



about Belton and the east entrance. Native of Eur.; introduced as a weed in 



N Amer —Annual, 30 to 60 cm. high, usually forming dense bushy clumps; leaves 



linear, 2 to 5 cm. long, spine-tipped, glabrous; flowers small, green, in the leaf axils; 



calyx winged in fruit. j t ^-i. 



In many parts of the West tliis is an abundant and troublesome weed. In the 

 plains region of Montana it is very common, and east of the park one sees many fields 

 BO densely covered with the Russian thistle that they appear to have been deliberately 

 seeded mth the plant. In autumn and winter when the plants are dead they are 

 rolled about by the wind as "tumbleweeds," and it is thus that the seeds are 

 scattered so efficiently. The dry plants are often lodged in great masses along wire 



TPT1CG3 



3. DONDIA Adans. 



1 Dondia depressa (Pursh) Britton. Abundant at east entrance in low alkaline 

 places on prairie. Sask. to Nev., N. Mex., and Kans. (D. ereda A. Nels.; Suaeda 

 depressa S. Wats.)— Glabrous annual, erect or spreading, very fleshy; leaves linear, 

 alternate, 1 to 2 cm. long; flowers green, borne in the leaf axils. 



The plants are usually purplish red, and form dense carpets. 



4. MONOLEPIS Schrad. 



1. Monolepis nuttalliana (Schult.) Greene. Poverty-weed. Occasional on the 



east slope at low altitudes, on open hillsides or in thickets. Wash, to Calif Tex., 



and Minn —Annual, 10 to 30 cm. high, branched from the base, nearly glabrous; 



leaves alternate, 1 to 4 cm. long, lobed and often toothed; flowers in small clusters in 



the leaf axils. ^„^.,^,-,T-.ir t 



5. CHENOPODIUM L. 



Annuals, with mealy or glandular pubescence; leaves alternate, entire, toothed, or 

 lobed; flowers very small, greenish, in spikes or dense clusters; sepals 3 to 5. 



Leaves deeply lobed, finely glandular-hairy, sweet-scented 1- C. botrys. 



Leaves entire or toothed, neither glandular-hairy nor sweet-scented. 

 Seed standing erect inside the calyx. 



Leaves white-mealy beneath; calyx green, not fleshy 2. C. salmum. 



Leaves green, not mealy; calyx becoming red and fleshy. 



Plants low, spreading, very fleshy; flowers in short spikes in the axils of the 

 , . . 3. C. humile. 



leaves 



Plants tall (30 to 60 cm.), erect, not very fleshy; flowers in rounded clusters in 



the axils of the leaves *• C- capitatum. 



Seed lying crosswise in the calyx. 

 Pericarp (outer coat of the fruit) easily separating from the shining seed. 



Leaves Hnear or nan-owly lanceolate 5. C. leptophyllum. 



Leaves Aombic-ovate 6. C atrovirens. 



Pericarp not separating from the seed. 



Clay X closed over the fruit at maturity ''• C. album. 



Calyx open and exposing the fruit 8. C. hians. 



1 Chenopodium botrys L. Jerusalem oak. Occasional along railroad at Belton. 

 Native of Eur.; adventive in N. Amer .-Plants 10 to 40 cm. high, branched, finely 

 viscid-hairy; leaves 1 to 5 cm. long; flowers in loose axillary clusters. 



2 Chenopodium salinum Standi. Frequent about east entrance, on open slopes 

 or about dried-up pools on prairie. Oreg. to N. Mex. and Nebr.-Plants usually 

 prostrate, much branched; leaves oblong to broadly ovate, 1 to 3 cm. long, toothed; 

 flowers in short spikes in the axils of the leaves. 



Doubtfully distinct from C. glaucum L., of the Old World. 



