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Photo is of parent taxon
Photo is of parent taxon
Habit Herbs acaulescent or short-caulescent, hirsute and glandular puberulent, or glabrous. Herbs caulescent or acaulescent, moderately to densely crinkly-villous (often appearing shaggy), and glandular puberulent.
Stems

(if present), usually unbranched, rarely with 1–several short laterals, 4–8 cm.

(if present) unbranched to few-branched, (0–)10–25 cm.

Leaves

(6.8–)9.5–23(–32) × (1.3–)2.4–4.5(–6.5) cm;

petiole (3–)4–11(–14) cm;

blade oblanceolate to spatulate, margins often undulate, usually regularly to irregularly dentate, rarely coarsely and irregularly pinnately lobed.

(3.5–)4–13(–16) × (0.7–)1–3.2 cm;

petiole (1.3–)1.7–10(–12) cm;

blade oblanceolate to rhombic-obovate, margins often coarsely and irregularly dentate or serrate, sometimes pinnately lobed, often with several larger lobes near blade base.

Flowers

floral tube (45–)75–110(–153) mm;

sepals (22–)30–45(–50) mm;

petals fading pink to pale rose, (21–)35–43(–50) mm;

filaments (16–)19–28(–35) mm, anthers (10–)12–17 mm;

style 85–180 mm.

buds often recurved when young;

floral tube (35–)40–70(–80) mm;

sepals 22–27(–32) mm;

petals fading pink to light rose, (25–)28–32(–34) mm;

filaments 11–15(–17) mm, anthers 9–12 mm;

style (50–)59–85(–96) mm.

Capsules

somewhat curved, lanceoloid-cylindrical to cylindrical, symmetrical throughout, sometimes slightly flattened on one side at base, (17–)25–45(–56) × 5–8 mm, valve margins with conspicuous, nearly smooth to irregular undulate ridge;

pedicel 2–7 mm.

straight, oblong-lanceoloid, base asymmetrical, 13–35(–40) × 5–6 mm;

valve margins with a low sinuate ridge to 8–15 small, nearly distinct tubercles;

pedicel 1–3 mm.

Seeds

narrowly obovoid, 2.5–3 × 1–1.4 mm, embryo 1/2 of seed volume, surface minutely papillose to reticulate;

seed collar forming narrow slit above raphe with a slightly sunken membrane, margin entire or obscurely sinuate distally.

narrowly obovoid, 2.1–2.6 × 1.1–1.3 mm, embryo 1/2 of seed volume, surface minutely papillose;

seed collar forming a narrow slit above raphe with a slightly sunken membrane, margin entire or obscurely sinuate distally.

2n

= 14, 28.

= 14, 28.

Oenothera cespitosa subsp. macroglottis

Oenothera cespitosa subsp. navajoensis

Phenology Flowering May–Jul(–Sep). Flowering (Apr–)May–Jun.
Habitat Open, igneous rocky slopes, talus, roadcuts, open or shaded and sandy or gravelly sites along streams, rarely on shale, in upper pinyon-juniper woodlands, Gambel oak scrub, ponderosa pine forests, ponderosa pine-Douglas fir forests, spruce-fir-lodgepole pine forests. Colorado Plateau region, forming small colonies on loose or compacted soil derived from clay, shale, fine-textured sandstone, or gypsum, on slopes and along small drainage patterns, often around harvester ant mounds, arroyos in somewhat sandy or gravelly soil, in shrubby commu­nities dominated by Atriplex confertifolia, A. corrugata, A. cuneata, Artemisia spinescens, Coleogyne ramosissima, Frankenia jamesii, Hilaria jamesii, with big sagebrush scrub or sage-grasslands, rarely in lower pinyon-juniper woodlands.
Elevation 2000–3100 m. (6600–10200 ft.) 1100–1900(–2100) m. (3600–6200(–6900) ft.)
Distribution
from FNA
CO; NM; UT; WY
from FNA
AZ; CO; NM; UT
Source FNA vol. 10. FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Pachylophus > Oenothera cespitosa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Pachylophus > Oenothera cespitosa
Sibling taxa
O. cespitosa subsp. cespitosa, O. cespitosa subsp. crinita, O. cespitosa subsp. marginata, O. cespitosa subsp. navajoensis
O. cespitosa subsp. cespitosa, O. cespitosa subsp. crinita, O. cespitosa subsp. macroglottis, O. cespitosa subsp. marginata
Synonyms Pachylophus macroglottis, O. cespitosa var. macroglottis, P. hirsutus O. cespitosa var. navajoensis, Pachylophus caulescens
Name authority (Rydberg) W. L. Wagner, Stockhouse & W. M. Klein: Ann. Missouri Bot. Gard. 70: 195. (1983) — (as caespitosa) W. L. Wagner, Stockhouse & W. M. Klein: Monogr. Syst. Bot. Missouri Bot. Gard. 12: 66, fig. 104. (1985) — (as caespitosa)
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