Flora of North America species comparison

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Eremothera

Eremothera gouldii

evening primrose, mooncup
Habit Herbs, annual, caulescent; with a taproot. Herbs glandular puberulent, sometimes also moderately or sparsely villous.
Stems

usually erect, sometimes ascending, usually well-branched from base, sometimes also distally, with white or reddish green exfoliating epidermis.

simple or loosely branched, 6–20 cm, usually flowering only distally.
Leaves

cauline, proximal ones often clustered near base, alternate;

stipules absent;

petiolate, often subsessile distally;

blade margins denticulate, crenate-dentate, serrulate, sinuate-toothed, or entire.

cauline, sometimes with lower ones clustered near base, 0.5–3.5 × 0.5–1 cm;

petiole 0–0.6 cm;

blade elliptic-lanceolate to elliptic, margins crenate-dentate or -serrulate.
Inflorescences

spikes, erect or nodding at anthesis, or flowers also in proximal leaf axils in some taxa.

only at terminal nodes, nodding at anthesis.
Flowers

bisexual, actinomorphic, buds erect;

floral tube deciduous (with sepals, petals, and stamens) after anthesis, with basal nectary;

sepals 4, reflexed singly or in pairs;

petals 4, usually white, rarely red or tinged red, without spots, fading pink or red;

stamens 8 in 2 unequal series, episepalous ones rarely abortive (E. minor), anthers versatile, pollen shed singly;

ovary 4-locular, without apical projection, style villous near base, strigillose, or glabrous, stigma entire, subglobose, surface unknown, probably wet and non-papillate.

opening at sunset;

floral tube 1.5–3 mm, villous in proximal 1/2 inside;

sepals 1–1.5 mm;

petals white, fading pinkish, 1.5–2.5 mm; episepalous filaments 1–2 mm, epipetalous filaments slightly shorter, anthers 0.4–0.9 mm;

style 3–4.5 mm, villous near base, stigma 0.5–0.8 mm diam., surrounded by anthers at anthesis.
Fruit

a capsule, straight or much contorted, narrowly cylindrical throughout or thickened proximally, terete or 4-angled, regularly but tardily loculicidal;

sessile.

Capsules

cylindrical and thickened proximally, spreading, straight to arcuate or weakly sigmoid, terete, thickened near base, tapering distally, 8–12 × 2–3 mm, regularly but tardily dehiscent.
Seeds

numerous, in 1 row per locule, usually monomorphic and narrowly obovoid to oblanceoloid, sometimes dimorphic, with seeds near base of capsule sharply angular and truncate-ellipsoid, finely reticulate, or seeds near base of capsule coarsely papillose.

monomorphic, light brown, ca. 1 mm, finely reticulate.
xI> = 7.

Eremothera

Eremothera gouldii
Phenology Flowering May–Oct.
Habitat Volcanic scree or cinder flats.
Elevation 1000–2000 m. (3300–6600 ft.)
Distribution
w United States; sc United States; nw Mexico
[BONAP county map]
from FNA
AZ; UT
[BONAP county map]
Discussion

Species 7 (7 in the flora).

Species of Eremothera are found mainly in the interior deserts and bordering areas of the western United States.

R. A. Levin et al. (2004) found strong molecular support for paraphyly in the broadly delimited Camissonia of P. H. Raven (1969). There was some support for a clade of Camissonia and Eremothera and another clade of Camissoniopsis, Neoholmgrenia, and Tetrapteron (Levin et al.), but without morphological features linking the members of these two clades. The monophyletic subclades of these two clades were recognized as genera by W. L. Wagner et al. (2007) whereas they were all treated by Raven as clearly distinguishable sections. Raven recognized four distinct groups within Eremothera (as Camissonia sect. Eremothera): E. refracta and its autogamous derivative, E. chamaenerioides; the very diverse E. boothii (with six subspecies) and two rare autogamous derivatives, E. gouldii and E. pygmaea; the local clay endemic E. nevadensis; and the widespread autogamous and often cleistogamous E. minor. Levin et al. included one species from each of these four groups in their molecular analyses and found strong support for Eremothera as circumscribed by Raven and maintained by Wagner et al. Eremothera is well defined by white petals that open in the evening and an entire, subglobose stigma; some species are visited by moths at anthesis and by bees the following morning (Raven). Reproductive features include: self-incompatible (E. boothii, E. refracta, and, possibly, E. nevadensis) or self-compatible; flowers vespertine; outcrossing and pollinated in the evening by small moths and the following morning by bees, in E. boothii subsp. decorticans by large oligolectic andrenid bees (E. G. Linsley et al. 1963, 1964, 1973), or autogamous, rarely cleistogamous (Raven).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Eremothera gouldii is known from Coconino and Mohave counties in Arizona and Washington County in Utah.

P. H. Raven (1969) determined Eremothera gouldii to be self-compatible and autogamous.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Capsules narrowly cylindrical; stems flowering distally.
→ 2
2. Sepals 4–6 mm; petals 3.5–10 mm; floral tube 4–7 mm; stigmas exserted beyond anthers at anthesis.
E. refracta
2. Sepals 1.5–2.5 mm; petals 1.8–3 mm; floral tube 1.5–3 mm; stigmas surrounded by anthers at anthesis.
E. chamaenerioides
1. Capsules cylindrical, proximally thickened; stems flowering distally and proximally.
→ 3
3. Stigma exserted beyond anthers at anthesis; sepals (2.7–)3.2–8 mm; petals (3–)3.5–9 mm.
→ 4
4. Primary stem short, lateral stems decumbent; leaves usually in a tuft distally; inflorescences erect; petals 3–5 mm; style 6–7 mm, glabrous.
E. nevadensis
4. Stems usually well branched at base and distally; leaves well distributed or basally clustered; inflorescences nodding; petals (3–)3.5–9 mm; style (6.5–)8.2–13.5(–15) mm, proximally villous.
E. boothii
3. Stigma surrounded by anthers at anthesis; sepals 0.8–2.6 mm; petals 0.8–2.5 mm.
→ 5
5. Stems flowering from base; herbs densely strigillose, often also glandular puberulent in inflorescences.
E. minor
5. Stems usually not flowering near base; herbs glandular puberulent, usually also villous.
→ 6
6. Seeds dimorphic, basal ones coarsely papillose; capsules 8–20 mm; leaves 1.5–6.5 × 0.5–2 cm.
E. pygmaea
6. Seeds monomorphic, all appearing smooth, finely reticulate; capsules 8–12 mm; leaves 0.5–3.5 × 0.5–1 cm.
E. gouldii
Source FNA vol. 10. Author: Warren L. Wagner. FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae Onagraceae > subfam. Onagroideae > tribe Onagreae > Eremothera
Sibling taxa
E. boothii, E. chamaenerioides, E. minor, E. nevadensis, E. pygmaea, E. refracta
Subordinate taxa
E. boothii, E. chamaenerioides, E. gouldii, E. minor, E. nevadensis, E. pygmaea, E. refracta
Synonyms Camissonia section eremothera, Oenothera section eremothera Camissonia gouldii, Oenothera gouldii
Name authority (P. H. Raven) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 125. (2007) (P. H. Raven) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 210. (2007)
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Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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