24 
Annual or perennial, but not by rootstocks. 
Plants prostrate ; achenes exserted. 
Leaves shorter than the internodes. 
Leaves longer than the internodes. 
Plants prostrate ; achenes included. 
Achene pointed at the apex, rounded at the base, 
Leaves mostly obtuse; style three-parted to the base. 
Leaves mostly acute ; style three-parted to below the middle. 
Achene pointed at both ends. 
Slender and wiry; leaves narrow; plants not arctic. 
Short and stout; leaves broad; plants arctic. 
Plants erect; achenes conspicuously exserted. 
Plants erect; achenes included, never conspicuously exserted. 
Flowers in axillary clusters. 
Branched throughout ; branches more or less spreading; large plants. 
Achene broadly ovoid; style three-parted to below the middle. 
Achene broadly ovoid; style three-parted to the base; leaves 
mostly fugacious. 
Achene ovoid ; style very short, three-parted to the base ; leaves 
not fugacious. 
Branched mainly from the base; branches erect or ascending ; 
small plants. 
Pedicels erect. 
Leaves oblanceolate, sometimes much reduced above; 
achene narrowly oblong; style nearly wanting. 
Leaves obovate, not much reduced above; achene oblong ; 
style three- parted. 
Leaves linear or linear-lanceolate ; achene ovoid. 
Pedicels deflexed. 
Achene oblong. 
Achene ovoid, not constricted at the ends. 
Achene ovoid; constricted at both ends. 
Flowers in mostly interrupted spicate racemes at the ends of branches. 
Achene oblong; filaments not conspicuously dilated ; style three- 
parted to the middle. 
Achene ovoid; filaments conspicuously dilated; style three- 
parted to base. 
Flowers mostly in continuous terminal spicate racemes. 
Racemes bracted. 
Outer calyx segments longer than the inner; bracts winged. 
Outer calyx segments not longer than the inner; bracts not 
winged. 
Racemes leafy ; leaves hardly imbricated. 
45. 
44, 
53. 
55. 
P. 
MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE. 
. RAY. 
mel ee 
MARITIMUM. 
- LITTORALE, 
. AVICULARE. 
. BELLARDI. 
- BOREALE. 
. EXSERTUM. 
» ERECTUM. 
. CAMPORUM. 
- RAMOSISSIMUM. 
. SAWATCHENSE. 
» MINIMUM. 
- TENUE. 
. DouGLAsit. 
. ENGELMANNI. 
. AUSTINAE. 
. SPERGULARIAEFORME. 
. NUTTALLII. 
POLYGALOIDES. 
56. P. WATSONT. 
54. P. KeLiocart. 
