Flora of North America species comparison

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Oenothera tubicula subsp. tubicula
Photo is of parent taxon
Habit Herbs short-lived perennial, glandular puberulent; from a stout taproot.
Stems

1–many, unbranched to densely branched, decumbent to erect, 4–53 cm.
Leaves

0.7–4.6 × 0.1–1.2 cm, sometimes fascicles of small leaves 0.2–1.5 cm present in non-flowering axils;

petiole 0–0.2 cm;

blade linear to ovate or obovate, base attenuate, margins entire, apex acute.
Flowers

usually several per stem opening per day near sunrise;

buds with free tips 0.5–2 mm;

floral tube 5–25(–33) mm, funnelform in distal 1/2 or more;

sepals 3–13 mm;

petals yellow, fading pale pink or pale purple, 5–20(–25) mm;

filaments 1–6 mm, anthers 2–7 mm, pollen 85–100% fertile;

style 9–30(–40) mm, stigma yellow, quadrangular, usually exserted beyond anthers.
Capsules

8–20 × 1.5–2.5 mm, hard, promptly dehiscent throughout their length.
Seeds

obovoid, 1–1.4 mm.
2n

= 14.

Oenothera tubicula subsp. tubicula
Phenology Flowering Apr–Aug.
Habitat Colonial, primarily on limestone soil, in flat arid grasslands, with Larrea and Yucca.
Elevation 600–1400 m. (2000–4600 ft.)
Distribution
from FNA
NM; TX; Mexico (Coahuila, Nuevo León, Tamaulipas, Zacatecas)
Discussion

Subspecies tubicula is known from Guadalupe County, New Mexico, south in the western side of the Pecos River drainage to western Texas, where it occurs from Culberson County east to Howard County, thence south through Brewster, Presidio, and Terrell counties, and probably most of central Coahuila, to northern Zacatecas, southwestern Nuevo León, and southwestern Tamaulipas.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Calylophus > subsect. Salpingia > Oenothera tubicula
Synonyms Galpinsia carlsbadiana, O. tubicula var. demissa, O. ×serrulatoides
Name authority unknown
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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