familyOnagraceae
subfamilyOnagraceae subfam. Onagroideae
tribeOnagraceae tribe Onagreae
genusOenothera
sectionOenothera sect. Anogra
speciesOenothera engelmannii

Oenothera engelmannii

(Small) Munz

Amer. J. Bot. 18: 316. 1931. (as engelmanni)

Warren L. Wagner
Basionym: Anogra pallida var. engelmannii Small Bull. Torrey Bot. Club 23: 176. 1896
Synonyms: A. engelmannii (Small) Wooton & Standley
Treatment appears in FNA Volume 10.
Please click on the illustration for a higher resolution version.
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Herbs winter-annual, conspic­uously villous throughout, also strigillose on leaves and distal parts; from a taproot. Stems erect, unbranched or with few, spreading branches, 30–50 (–80) cm. Leaves in a basal rosette and cauline, rosette weakly developed or absent, at least during flowering, (1–) 2–6 (–8) × 1–2 (–3) cm; sessile; blade lanceolate to oblong-lanceolate, proximal ones sometimes oblanceolate, margins coarsely repand-dentate or pinnatifid. Flowers 1–several opening per day near sunset; buds nodding, weakly quadran­gular, without free tips; floral-tube 20–30 mm; sepals 13–21 mm, not spotted or with scattered small, maroon spots; petals white, fading pink, broadly obovate or obcordate, 15–30 mm; filaments 14–16 mm, anthers 6–8 mm; style 40–50 mm, stigma exserted beyond anthers at anthesis. Capsules widely spreading, woody in age, straight or slightly curved, cylindrical, obtusely 4-angled, especially toward base, tapering gradually from base to apex, 30–60 × 2–3 mm; sessile. Seeds numerous, in 1 row per locule, brown, narrowly obovoid, 1–1.5 mm. 2n = 14.


Phenology: Flowering Apr–Aug(–Sep).
Habitat: Sandy prairies, dunes, disturbed areas, roadsides.
Elevation: 500–1300 m.

Distribution

Colo., Kans., N.Mex., Okla., Tex.

Discussion

Oenothera engelmannii is self-incompatible (W. L. Wagner et al. 2007; K. E. Theiss et al. 2010). It has a relatively narrow distribution in sandy areas of eastern New Mexico and western Texas, extending to southeastern Colorado, western Oklahoma, and southwestern Kansas. The flower size seems to vary, with larger flowers in eastern New Mexico and considerably smaller flowers in the eastern part of its range.

Selected References

None.

Lower Taxa

None.
... more about "Oenothera engelmannii"
RDF feed
2n chromosome quantity
14 +
4-locular septum architecture
incomplete +
4-locular septum architecture or structure in adjective form
1-locular +
Androecium position
epigynous +
Anther fixation
versatile +
Anther some measurement
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Author
Warren L. Wagner +
Authority
(Small) Munz +
Basal leaf arrangement
alternate +
Basal leaf position
cauline +
Basal leaf presence
absent +
Basal rosette prominence
conspicuous +
Base coloration
pale green +  and yellow usually fading orange purple pale-yellow reddish or whitish +
Base shape
pedicel-like +
Basionyms
Anogra pallida var. engelmannii +
Berry architecture or shape
nutlike +
Berry dehiscence
indehiscent +  and loculicidal +
Blade margin shape
sinuate-dentate +  and pinnatifid denticulate subentire or entire +
Blade position
proximal +
Blade shape
oblanceolate +, lanceolate +  and oblong-lanceolate +
Branch orientation
spreading +
Branch quantity
few +
Bud orientation
nodding +
Bud shape
quadrangular +
Capsule architecture
sessile +
Capsule architecture or shape
nutlike +
Capsule architecture or structure in adjective form
4-locular +
Capsule arrangement or shape
contorted +
Capsule condition or texture
dry +
Capsule course
curved +  and straight +
Capsule dehiscence
dehiscent +
Capsule length
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Capsule orientation
spreading +
Capsule quantity
1/2 +
Capsule shape
tapering +, 4-angled +  and cylindrical +
Capsule texture
woody +
Capsule width
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Carpel quantity
Many (?) +
Cel reproduction
vegetative +
Distribution
Colo. +, Kans. +, N.Mex. +, Okla. +  and Tex. +
Elevation
500–1300 m. +
Embryo-sac coating
oily +
Embryo-sac course
straight +
Embryo-sac presence
absent +
Embryo coating
oily +
Embryo course
straight +
Embryo presence
absent +
Endosperm coating
oily +
Endosperm course
straight +
Endosperm presence
absent +
Epidermis coloration
pink +  and white +
Epidermis relief
exfoliating +
Filament architecture
dithecal +
Filament fixation
basifixed +  and versatile +
Filament fusion
distinct +
Filament some measurement
1.4 cm14 mm <br />0.014 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
Floral-tube atypical some measurement
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
Floral-tube duration
deciduous +
Floral-tube orientation
recurved +
Floral-tube presence
absent +
Floral-tube pubescence
hispid +, lanate +  and glabrous +
Floral-tube quantity
, +
Floral-tube some measurement
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flower architecture
zygomorphic +  and actinomorphic +
Flower architecture or arrangement or growth form
solitary +
Flower odor
unscented +
Flower part duration
deciduous +
Flower part life cycle
anthesis +
Flower quantity
1 +  and several +
Flower reproduction
bisexual +
Fruit architecture
winged +
Fruit course
curved +  and straight +
Fruit dehiscence
indehiscent +  and dehiscent +
Fruit shape
4-angled +, terete +, tapering +, cylindrical +, ellipsoid +, clavate +, ovoid ellipsoid +  and cylindrical rhombic-obovoid or globose +
Habitat
Sandy prairies, dunes, disturbed areas, roadsides. +
Hair height or length or size
short +
Hair position relational
interlocking +
Herb architecture
caulescent +
Herb duration
winter-annual +
Herb growth form
suffrutescent +
Herb pubescence
strigillose +  and villous +
Illustration
Present +
Indusium architecture
peltate +
Indusium prominence
conspicuous +
Inflorescence position
axillary +
Lateral branch height or length or size
short +
Lateral root orientation
spreading +
Leaf-axil orientation
nodding +  and erect +
Leaf architecture
simple +
Leaf arrangement
alternate +
Leaf atypical some measurement
13 cm130 mm <br />0.13 m <br /> (26 cm260 mm <br />0.26 m <br />) +
Leaf condition
later +
Leaf development
developed +
Leaf duration
deciduous +
Leaf position
cauline +
Leaf presence
absent +
Leaf some measurement
1 cm10 mm <br />0.01 m <br /> (13 cm130 mm <br />0.13 m <br />) +
Lobe arrangement or course or shape
linear +
Lobe quantity
4 (?) +
Locule arrangement or growth form
clustered +
Locule quantity
many +
Margin shape
pinnatifid +  and repand-dentate +
Mouth condition
closing +
Nectary presence
absent +
Number of lower taxa
0 +
Ovary architecture
pedicellate +  and sessile +
Ovary architecture or structure in adjective form
1-locular +
Ovary position
inferior +
Ovule architecture
bitegmic +
Ovule arrangement or growth form
clustered +
Ovule orientation
anatropous +
Ovule quantity
1 +  and 8 +
Perianth position
epigynous +
Petal arrangement
imbricate +
Petal arrangement or shape
convolute +
Petal coloration
fading pink +  and white +
Petal presence
absent +
Petal quantity
4 +
Petal shape
obcordate +  and obovate +
Petal some measurement
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Phenology
Flowering Apr–Aug(–Sep). +
Pollen-grain dehiscence or orientation
longitudinal +
Pollen arrangement
singly +
Polyad arrangement
singly +
Proximal part reproduction
sterile +
Publication title
Amer. J. Bot. +
Publication year
1931 +
Raphide quantity
abundant +
Reference
None +
Root position
lateral +
Rosette architecture
sessile +
Rosette atypical length
6 cm60 mm <br />0.06 m <br /> (8 cm80 mm <br />0.08 m <br />) +
Rosette atypical width
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Rosette development
developed +
Rosette length
2 cm20 mm <br />0.02 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Rosette position
basal +  and cauline +
Rosette presence
absent +
Rosette width
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Row atypical quantity
2 (4) +
Row quantity
1 +
Secretion condition
wet +
Secretion condition or texture
dry +
Secretion relief
papillate +
Secretion shape
clavate +  and globose +
Seed atypical quantity
1 (160) +
Seed coloration
brown +
Seed quantity
numerous +
Seed relief
sculptured +  and smooth +
Seed shape
obovoid +
Seed size
reduced +
Seed some measurement
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Sepal arrangement or dehiscence
valvate +
Sepal coloration
maroon spots +, with scattered small +  and not spotted +
Sepal duration
deciduous +
Sepal orientation
reflexed +
Sepal quantity
4 +
Sepal some measurement
1.3 cm13 mm <br />0.013 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
Septum architecture
incomplete +
Septum arrangement
parietal +, axile +  and placentation +
Septum fragility
fragile +
Septum presence
absent +
Septum width
thin +
Series length or size
longer +
Series quantity
2 +
Series size
unequal +
Series variability
equal +
Set length or size
longer +
Set quantity
2 +
Set variability
equal +
Shoot derivation
adventitious +
Shoot orientation
arising +
Shrub architecture
unarmed +
Shrub growth form
not clonal +
Shrub habitat
aquatic +, amphibious +  and terrestrial +
Slit dehiscence or orientation
longitudinal +
Spike architecture
leafy +
Stamen quantity
8 +
Stamen size
in 2 unequal series +  and subequal +
Stamen size or quantity
2 times as many or as many as sepals +
Stem architecture
with few , spreading branches +  and unbranched +
Stem atypical some measurement
50 cm500 mm <br />0.5 m <br /> (80 cm800 mm <br />0.8 m <br />) +
Stem growth form or orientation
decumbent +
Stem orientation
erect +
Stem some measurement
30 cm300 mm <br />0.3 m <br /> (50 cm500 mm <br />0.5 m <br />) +
Stigma architecture
peltate +
Stigma development
developing +
Stigma quantity
1 +
Stigma shape
divided +
Stipule architecture
petiolate +  and sessile +
Stipule duration
caducous +
Stipule position
intrapetiolar +
Stipule presence
absent +
Stipule size
small +
Style pubescence
pubescent +  and glabrous +
Style quantity
1 +
Style some measurement
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
Subshrub architecture
unarmed +
Subshrub growth form
not clonal +
Subshrub habitat
aquatic +, amphibious +  and terrestrial +
Surface architecture
smooth +, reticulate +  and furrowed +
Surface architecture or pubescence or relief
smooth +
Surface architecture or shape
entire +
Surface condition
wet +
Surface duration
persisting +
Surface life cycle
anthesis +
Surface prominence
obscured +
Surface quantity
7 (?) +
Surface relief
alveolate +
Surface shape
beaded +
Synonyms
A. engelmannii +
Taxon family
Onagraceae +
Taxon name
Oenothera engelmannii +
Taxon parent
Oenothera sect. Anogra +
Taxon rank
species +
Tetrad arrangement
singly +
Tetrad dehiscence
3(-5)-aperturate +
Tip fusion
free +
Tip height or length or size
short +
Viscin thread dehiscence or orientation
longitudinal +
Viscin thread fusion
united +
Volume
Volume 10 +
Wall texture
woody +  and hard +
Wing architecture
smooth +  and erose +
Wing condition or texture
dry +
Wing relief
papillate +
Wing width
thick +