Chylismia scapoidea

(Torrey & A. Gray) Nuttall ex Raimann in H. G. A. Engler and K. Prantl

Nat. Pflanzenfam. 96[III,7]: 217. 1893.

Basionym: Oenothera scapoidea Torrey & A. Gray Fl. N. Amer. 1: 506. 1840
Synonyms: Camissonia scapoidea (Torrey & A. Gray) P. H. Raven O. brevipes var. scapoidea (Torrey & A. Gray) H. Léveillé
Treatment appears in FNA Volume 10.

Herbs annual, strigillose, vil­lous, or glandular puberulent. Stems usually unbranched, sometimes branched from base, 3–45 cm. Leaves primarily in basal rosette, cauline poorly developed or absent, 1–18 × 0.5–3.5 cm; petiole 0.5–6.5 cm; blade pinnately lobed or lateral lobes greatly reduced or absent, sometimes mixed on same plant, terminal lobe narrowly ovate to ovate or elliptic, 1–6.5 × 0.5–3.3 cm, margins irregularly dentate to subentire, oil cells on abaxial surface inconspicuous or conspicuous, pale yellowish brown or dark brown. Racemes nodding, elongating in fruit. Flowers opening at sunrise; buds with or without subapical free tips less than 1 mm; floral tube 1–4 mm, sparsely villous or glabrous inside; sepals 1.2–5 mm; petals bright yellow, often with red dots near base, fading pale yellow or yellowish orange, 1.5–5.5(–8) mm; stamens unequal, filaments of antisepalous stamens 1.2–6 mm, those of antipetalous ones 0.5–4 mm, anthers 1–2.5 mm, ciliate or glabrous; style 3–11 mm, stigma surrounded by anthers at anthesis. Capsules ascending, clavate, 8–50 mm; pedicel 4–20 mm. Seeds 1–2 mm.

Distribution

w United States.

Discussion

Subspecies 4 (4 in the flora).

P. H. Raven (1962, 1969) determined this species to be self-compatible and primarily autogamous.

Selected References

None.

Key

1 Oil cells lining veins of leaf blades abaxially usually pale yellowish brown, inconspicuous, rarely darker; leaf blades usually unlobed, rarely pinnately lobed with few, small lateral lobes, margins subentire. > 2
2 Capsules (10–)15–30 mm; petals 1.7–5 mm. Chylismia scapoidea subsp. scapoidea
2 Capsules 25–50 mm; petals 1.5–2 mm. Chylismia scapoidea subsp. macrocarpa
1 Oil cells lining veins of leaf blades abaxially dark brown, conspicuous; leaf blades pinnately lobed, lobes well developed or with few, small lateral lobes or unlobed, margins dentate. > 3
3 Petals 1.8–4 mm; lateral lobes of leaves often few or absent, sometimes well developed; capsules 8–20(–28) mm. Chylismia scapoidea subsp. brachycarpa
3 Petals 4–5.5(–8) mm; lateral lobes of leaves usually well developed, sometimes poorly developed; capsules 16–38 mm. Chylismia scapoidea subsp. utahensis
... more about "Chylismia scapoidea"
Warren L. Wagner +
(Torrey & A. Gray) Nuttall ex Raimann in H. G. A. Engler and K. Prantl +
Oenothera scapoidea +
w United States. +
Nat. Pflanzenfam. +
Camissonia scapoidea +  and O. brevipes var. scapoidea +
Chylismia scapoidea +
Chylismia sect. Chylismia +
species +