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Arizona sun cup

golden suncup, Mojave suncup, yellow cups

Habit Herbs slender, often branched distally, villous, sometimes also strigillose, at least distally. Herbs annual, moderately to densely villous, sometimes strigillose.
Stems

branched, 3–75 cm.

Leaves

primarily in basal rosette, cauline greatly reduced when present, 6–14 × 1.5–3.5 cm;

petiole 1.5–4(–11) cm;

blade pinnately lobed or lateral lobes greatly reduced or absent, often mixed on same plant, terminal lobe usually ovate, rarely elliptic, 2.5–6.9 × 1.5–7 cm, margins irregularly dentate, oil cells on abaxial surface inconspicuous.

Racemes

nodding, mostly elongating after flowers.

Flowers

buds individually reflexed, without free tips or with apical free tips less than 1 mm;

floral tube orange-brown inside, 3–5 mm;

petals often with red dots at base, often fading reddish, 3–8 mm;

anthers 2.5–5 mm.

opening at sunrise;

buds sometimes individually reflexed, without free tips or with subapical free tips 1–2 mm, or with minute, apical free tips less than 1 mm;

floral tube 3–8 mm, densely short-villous inside proximally;

sepals 5–9 mm;

petals bright yellow, sometimes with red dots at base, fading yellow to orange or reddish, 3–18 mm;

stamens subequal, filaments 3–6 mm, anthers 2.5–6 mm, ciliate;

style 10–18 mm, stigma exserted beyond anthers at anthesis.

Capsules

18–60 mm;

pedicel 2.5–5 mm.

ascending or spreading, oblong-cylindrical, 18–92 mm;

pedicel 2–20 mm.

Seeds

1–1.5 mm.

2n

= 14.

Chylismia brevipes subsp. arizonica

Chylismia brevipes

Phenology Flowering Feb–Apr.
Habitat Rocky slopes, flats.
Elevation 70–300 m. (200–1000 ft.)
Distribution
from FNA
AZ; CA
[BONAP county map]
sw United States
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies arizonica is known from Yuma County, Arizona, and eastern Imperial County, California. It hybridizes with Chylismia claviformis subspp. peeblesii, rubescens, and yumae.

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

Subspecies 3 (3 in the flora).

P. H. Raven (1962, 1969) determined this species to be self-incompatible.

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

Key
1. Flower buds individually reflexed; petals often fading reddish, 3–8 mm.
subsp. arizonica
1. Flower buds not individually reflexed; petals fading yellow to orange, 6–18 mm.
→ 2
2. Plants stout, villous; buds with subapical free tips 1–2 mm; petals usually without red dots at base.
subsp. brevipes
2. Plants slender, usually strigillose, sometimes also villous proximally; buds with apical free tips 0–1 mm; petals often with red dots near base.
subsp. pallidula
Source FNA vol. 10. FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Chylismia > sect. Chylismia > Chylismia brevipes Onagraceae > subfam. Onagroideae > tribe Onagreae > Chylismia > sect. Chylismia
Sibling taxa
C. brevipes subsp. brevipes, C. brevipes subsp. pallidula
C. arenaria, C. atwoodii, C. cardiophylla, C. claviformis, C. confertiflora, C. eastwoodiae, C. exilis, C. heterochroma, C. megalantha, C. multijuga, C. munzii, C. parryi, C. scapoidea, C. specicola, C. walkeri
Subordinate taxa
C. brevipes subsp. arizonica, C. brevipes subsp. brevipes, C. brevipes subsp. pallidula
Synonyms Oenothera brevipes subsp. arizonica, Camissonia brevipes subsp. arizonica Oenothera brevipes, Camissonia brevipes
Name authority (P. H. Raven) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 205. (2007) (A. Gray) Small: Bull. Torrey Bot. Club 23: 194. (1896) — (as Chylisma)
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