familyAsteraceae
genusHelianthus
speciesHelianthus nuttallii
subspeciesHelianthus nuttallii subsp. rydbergii
Helianthus nuttallii subsp. rydbergii
Brittonia 18: 77. 1966.
Common names: Rydberg’s sunflower
Endemic
Basionym: Helianthus rydbergii Britton Man. Fl. N. States, 993. 1901
Treatment appears in FNA Volume 21. Treatment on page 167.
Plants usually 100–250 cm. Leaves all or mostly opposite; blades lanceolate to nearly ovate, apices acute to obtuse, abaxial faces hispid to hispidulous. Phyllaries: abaxial faces ± glabrate or sparsely hairy (longer hairs 0.5–1 mm).
Phenology: Flowering late summer–fall.
Habitat: Open areas, sandy dry soils, wet places
Elevation: 200–1000 m
Distribution
Alta., Man., Ont., Que., Sask., Colo., Iowa, Minn., Mont., Nebr., N.Dak., S.Dak.
Discussion
Selected References
None.
Lower Taxa
None.
... more about "Helianthus nuttallii subsp. rydbergii"
introrse +
connate +
herbaceous +
acute;obtuse +
scarious +
absent +
yellow +
hirsute +
papillate +
continuous +
cuneate +
3-nerved +
lanceolate;nearly ovate +
winged;ribbed;winged;ribbed +
1;15 +
stigmatic +
absent +
Rydberg’s sunflower +
zygomorphic +
monomorphic +
dimorphic +
glabrate +
3mm;5mm +
staminate +
straight +
distinct +
proximal +
1;5 +
bisexual +
dispersed +
singly +
discoid +
indeterminate +
1;6 +
surrounding +
hemispheric +
opposite +
cauline +
yellow +
triangular +
lobed +
2-carpellate +
inferior +
attached +
anatropous +
3-toothed +
persistent +
falling +
absent +
coroniform +
tough +
thick +
absent +
connate +
persistent +
distinct +
falling +
unequal +
Brittonia +
1966 +
neuter +
absent +
sterile +
paleate +
flat;slightly convex +
fibrous +
shorter +
exalbuminous +
modifed +
2;3 +
Endemic +
alternate +
branched +
erect +
continuous +
2-branched +
papillate +
Helianthus nuttallii subsp. rydbergii +
Helianthus nuttallii +
subspecies +
campanulate +
equaling +
shorter +
perennial +