Flora of North America species comparison

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Neoholmgrenia

evening primrose, lemondrops
Habit Herbs, annual, caulescent; with slender taproot.
Stems

densely leafy distally, nearly leafless proximally, with many slender, ascending branches from base.
Leaves

cauline, alternate, often appearing subverticillate and densely tufted;

stipules absent;

sessile;

blade margins entire.
Inflorescences

spikes, densely leafy.
Flowers

bisexual, actinomorphic, buds nodding, becoming erect;

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

sepals 4, reflexed singly or in pairs;

petals 4, yellow, fading pale yellowish orange, without spots;

stamens 8 in 2 unequal series, epipetalous ones sometimes very reduced, or 4 in 1 series, epipetalous ones absent, anthers versatile, pollen shed singly;

ovary 4-locular, stigma entire, subglobose, surface probably wet and non-papillate.
Fruit

a capsule, straight, strongly flattened, somewhat torulose, regularly loculicidal, dehiscent nearly throughout length;

sessile.
Seeds

numerous, in 1 row per locule, narrowly obovoid, smooth, shiny, without dots or blotches.
xI> = 7.

Neoholmgrenia
Distribution
w North America
[BONAP county map]
Discussion

Species 2 (2 in the flora).

R. A. Levin et al. (2004) found strong molecular support for Neoholmgrenia in a clade with Camissoniopsis and Tetrapteron. P. H. Raven (1969) found Neoholmgrenia (as Camissonia sect. Nematocaulis) to be one of the most distinctive groups in Camissonia by virtue of its relatively short (less than 10 mm), flattened capsules and densely clustered leaves near the tips of otherwise leafless stems. Reproductive features include: self-compatible; flowers diurnal; outcrossing and pollinated by small bees or flies, or autogamous and occasionally cleistogamous (Raven).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Petals 2.5–5 mm; styles 4.5–6 mm.
N. hilgardii
1. Petals 0.8–2.3 mm; styles 1.7–3 mm.
N. andina
Source FNA vol. 10. Author: Warren L. Wagner.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae
Subordinate taxa
N. andina, N. hilgardii
Synonyms Holmgrenia, Oenothera section nematocaulis
Name authority W. L. Wagner & Hoch: Novon 19: 131. (2009)
Web links 
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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