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big heartleaf sun cup

heart leaf primrose, heartleaf suncup

Habit Herbs glandular puberulent throughout, often also sparsely villous. Herbs annual or perennial, villous and glandular puberulent.
Stems

usually well branched, forming bushy habit, 20–100 cm.

Leaves

cauline, mostly toward base;

petiole (0.7–)2.5–7.5 cm;

blade cordate-ovate to -orbiculate, 2.5–7.5 × 2.3–5.5 cm, smaller distally, margins erose-dentate.

Racemes

nodding, congested.

Flowers

floral tube 9–14 mm;

petals 7–11 mm;

style 14–20 mm, stigma usually exserted beyond anthers at anthesis.

floral tube 4.5–14 mm, villous inside;

sepals 3–9 mm;

petals yellow, 3–12 mm;

filaments 1–3 mm, anthers 2–4 mm;

style 8–23 mm, stigma surrounded by or exserted just beyond anthers at anthesis.

Capsules

ascending, cylindrical, 20–55 mm;

pedicel 1–18 mm.

Seeds

0.5–0.7 mm.

2n

= 14.

Chylismia cardiophylla subsp. robusta

Chylismia cardiophylla

Phenology Flowering Mar–May.
Habitat Rocky borders of washes and hillsides, with Ambrosia dumosa and Larrea tridentata.
Elevation 600–1400 m. (2000–4600 ft.)
Distribution
from FNA
CA
[BONAP county map]
sw United States; nw Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies robusta is known from the western and southern margins of Death Valley, Inyo County.

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

Subspecies 3 (2 in the flora).

P. H. Raven (1962, 1969) determined this species to be self-compatible, but primarily outcrossing. Subspecies cedrosensis (Greene) W. L. Wagner & Hoch, occurs in Baja California and adjacent Sonora, Mexico.

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

Key
1. Herbs villous, sometimes also glandular puberulent; floral tubes 4.5–12 mm.
subsp. cardiophylla
1. Herbs glandular puberulent throughout, often also sparsely villous; floral tubes 9–14 mm.
subsp. robusta
Source FNA vol. 10. FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Chylismia > sect. Lignothera > Chylismia cardiophylla Onagraceae > subfam. Onagroideae > tribe Onagreae > Chylismia > sect. Lignothera
Sibling taxa
C. cardiophylla subsp. cardiophylla
C. arenaria, C. atwoodii, C. brevipes, 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. cardiophylla subsp. cardiophylla, C. cardiophylla subsp. robusta
Synonyms Oenothera cardiophylla subsp. robusta, Camissonia cardiophylla subsp. robusta Oenothera cardiophylla, Camissonia cardiophylla
Name authority (P. H. Raven) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 206. (2007) (Torrey) Small: Bull. Torrey Bot. Club 23: 193. (1896) — (as Chylisma)
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