Flora of North America species comparison

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Stanleya confertiflora

biennial stanleya, Oregon princesplume
Habit Annuals or biennials; (glaucous), glabrous throughout.
Stems

erect, unbranched, (slightly ribbed), 2–6(–8) dm.
Basal leaves

(often withered by flowering);

blade obovate to ovate, margins entire.
Cauline leaves

sessile;

blade (fleshy), lanceolate, (2.2–)4–13(–16) cm × (5–)10–30(–40) mm, (smaller distally, base auriculate to sagittate), margins entire.
Racemes

dense, (slightly or not elongated in fruit).
Flowers

sepals oblong-linear, 6–12 mm;

petals yellow becoming whitish, narrowly linear to filiform, (12–)14–25 × 0.5–1.5 mm, (margins crisp), claw (nearly linear), 5–11 mm, slightly wider at base;

filaments 12–17 mm;

anthers 3–4.5 mm;

gynophore (6–)10–18 mm.
Fruiting pedicels

horizontal to divaricate-ascending, 10–20(–26) mm.
Fruits

suberect to divaricate-ascending, slightly curved inward, (torulose), subterete, 2–5.2(–6) cm × 1.5–2.2 mm;

ovules 40–62 per ovary;

style 0.6–1.7 mm.
Seeds

oblong, 1.5–2.5 × 0.8–1 mm.

Stanleya confertiflora
Phenology Flowering Apr–Jun.
Habitat Barren clay slopes in sagebrush communities, heavy clay flats, loose soil mounds, dry sandy grounds, alkaline meadows and flats
Elevation 600-1500 m (2000-4900 ft)
Distribution
from FNA
ID; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Stanleya confertiflora is distributed in Gooding, Owyhee, and Washington counties in Idaho, and in Baker, Harney, and Malheur counties in Oregon.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 696.
Parent taxa Brassicaceae > tribe Thelypodieae > Stanleya
Sibling taxa
S. albescens, S. bipinnata, S. elata, S. pinnata, S. tomentosa, S. viridiflora
Synonyms S. viridiflora var. confertiflora, S. annua, S. rara
Name authority (B. L. Robinson) Howell: Fl. N.W. Amer., 59. (1897)
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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