36 NORTH AMERICAN FLORA 
VIT. Saccarrag 
A single species. 
VIII. ARGENTEAE 
Leaf-blades closely repand-dentate. 
Leaf-blades entire or remotely and irregularly dentate. 
Leaf-blades never subhastate or angled at the base, mostly oblong or 
oblong-ovate. 
Leaf-blades, at least some of them, subhastate or angled at the base. 
Bracts compressed, the sides smooth or with few short obtuse 
tubercles, the margins usually shallowly dentate. 
Upper leaves short-petiolate, the lowest opposite. 
Upper leaves sessile, the lowest alternate. 
Branches terete; plants coarsely and loosely furfuraceous; 
seed 1.5 mm. long. 
Branches angled; plants finely and very closely furfuraceous; 
seed 2 mm. long. 
Bracts usually pedicellate, 5-7 mm. long, the margins 
obtusely dentate, the sides usually tuberculate or 
cristate. 
Bracts sessile, 3-5 mm. long, the margins acutely dentate, 
the sides usually unappendaged. 
Bracts not compressed, the sides densely covered with long, acute, 
foliaceous appendages, the margins deeply laciniate. 
Staminate flowers in separate glomerules, these arranged in 
elongate, interrupted, nearly naked, terminal spikes. 
Staminate flowers usually mixed with the pistillate ones, or, if 
in separate glomerules, the glomerules axillary. 
Bracts mostly long-pedicellate. 
Bracts sessile. 
IX. POWELLIANAE 
A single species. 
XX. TRUNCATAE 
Plants erect; bracts 3-dentate at the apex. 
Plants procumbent; bracts several-dentate at the apex. 
XI. WoLrlanaE 
A single species. 
XO. 
Leaves, at least the lower ones, opposite. 
Plants erect; only the lowest leaves opposite; bracts dentate above the 
middle, 3-3.5 mm. long. 
Plants prostrate; leaves all opposite; bracts hastate-ovate, entire, 
2 mm. long. 
Leaves all alternate. 
Leaf-blades cordate at the base. 
Leaf-blades rounded to acute at the base. 
Branches copiously villous, at least about the inflorescence. 
Branches merely furfuraceous. 
Sides of the bracts tuberculate. 
Leaf-blades linear, 7-17 mm. long; bracts ovate-oblong or 
oblong, tuberculate at or above the middle. 
Leaf-blades ovate to oblong, 2—7 mm. long; bracts ovate or 
triangular-ovate, tuberculate below the middle. 
Sides of the bracts smooth. 
Bracts 2-3 mm. long, subhastate, denticulate or crenulate. 
Bracts 1-2 mm. long, ovate, entire. 
PUSILLAE 
XIII. SEMIBACCATAE 
A single species. 
XIV. ARENARIAE | 
Leaf-blades dentate. 
Staminate glomerules in elongate, usually paniculate spikes. 
Leaf-blades, at least the upper ones, linear. 
Leaf-blades broader than linear. 
Bracts 4-6 mm. long. 
Leaf-blades sinuate-dentate, the lower often hastate; bracts 
6 mm. long. 
Leaf-blades repand-dentate, never hastate; bracts 4-5 mm. 
long. 
Bracts 2-3 mm. long. 
17. 
18. 
19. 
20. 
21. 
22. 
23. 
24. 
25. 
26. 
27. 
28. 
29, 
30. 
31. 
32. 
33. 
34. 
35. 
36. 
37. 
38. 
39. 
43. 
40. 
51. 
> > DP D 
[VoLuME 21 
. Saccaria, 
. trinervata. 
. coronata, 
. argentea. 
. sordida. 
. expansa, 
. mohavensis. 
. Rydbergii. 
. Caput-Medusae, 
. Hiilmani. 
. Powellii. 
. truncata, 
. subdecumbens. 
. Wolf. 
. tularensis. 
. depressa. 
. cordulata. 
. Parishit. 
. Greenei. 
. tenuissimea. 
. minuscula. 
. pusilla. 
. semibaccata. 
. inifolia. 
. Lampa. 
. Aldamae. 
