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76 MISSOURI BOTANICAL GARDEN. 
Leaves minutely revolute, ......smoother seeded forms of 
the group of Z. palustre, 
Leaves not revolute: stem simple or few branched below. 
Leaves rather ample, ovate to elliptical, some of them 
usually toothed. (Z. glandulosum, with seed papille 
collapsed, might be sought here.) 
Glandular-pubescent: leaves sessile, some of them 
broadly decurrent: seeds very long, blunt at 
base, tapering above into a broad pale apex, 
«+eeeeH. Halleanum. 
' Crisp-pubescent in lines: leaves not decurrent: 
seeds shorter, more acute below, with narrower 
sometimes very short and abrupt beak. 
Alaskan species with rosy flowers. 
Erect: leaves elliptical, tapering to each end, 
petioled; flowers nodding......H. Bongardi. 
Ascending at base: leaves ovate, the upper ses- 
sile; flowers erect.........E. Behringianum. 
Extending southward in the mountains: stems as- 
cending at base: leaves petioled. 
Flowers violet, medium sized: leaves dark 
green or purple: seeds blunt above,... 
exceptionally smooth-seeded plants of 
«+e+++H. Hornemanni. 
Flowers white, very small: leaves thin, light 
green: seeds (seen from in front) gradually 
attenuated to the beak........++..H. alpinum. 
Leaves quite small, usually nearly entire. é 
Stem ascending or almost creeping, often S-shaped, 
cespitose: leaves relatively broad and spreading, 
uniformly distributed,........H. anagaliidifolium. 
Stem erect, not cespitose: leaves strict, the up- 
permost remote and linear........H. Oregonense. 
2. Seeds papillately roughened under the microscope. 
a, Leaves linear to lanceolate, nearly entire, generally without 
s conspicuous lateral veins. 
Leaves slightly revolute: sobols filiform, at length ending 
in large turions: seeds large, elongated. 
Simple or nearly so, crisp-pubescent: leaves sessile, 
USUAL]Y ODtUBE. ce cevece cocevcccscscess E. palustre. 
Mostly branched above; leaves more acute. 
Crisp-pubescent: leaves very narrow, petioled, 
iviwes E. lineare. 
Softly white-glandular: leaves lanceolate, sessile, 
weaves E. strictum. 
Leaves not revolute, sometimes involute in paniculatum. 
Innovations and seeds as in the last group, 
coaees hybrids of Z. palustre. 
