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lilacbush

garden aubrieta, lilacbush

Habit Perennials; (often loosely pulvinate or cespitose, caudex many-branched); not scapose; pubescent, trichomes stellate, short-stalked or sessile, mixed with coarser, stalked, forked, and simple ones. Plants forming mats or cushions; densely pubescent, trichomes stellate, mixed with fewer, setiform and forked ones.
Stems

erect to decumbent, branched basally, (slender).

several from base (caudex), ascending to procumbent, 0.7–3(–5) dm, pubescent.

Leaves

basal and cauline;

petiolate or sessile [subsessile];

basal rosulate, petiolate, blade margins entire or dentate;

cauline petiolate or sessile [subsessile], blade (base not auriculate), margins entire or dentate.

Basal leaves

petiole 0.1–1 cm;

blade obovate, oblanceolate, or rhombic, (0.5–)1–3(–4.5) cm × (2–)4–13(–20) mm, base cuneate to attenuate, margins entire or 1–3 teeth on each side, surfaces densely pubescent.

Cauline leaves

petiolate or (distalmost) sessile;

blade similar to basal.

Racemes

(few- to several-flowered), elongated in fruit.

1–13-flowered, (lax).

Flowers

sepals erect, oblong, lateral pair saccate basally, (glabrous or pubescent);

petals usually purple to violet, rarely white [pink], obovate [spatulate], (apex obtuse);

stamens tetradynamous;

filaments narrowly winged, (lateral pair with toothed appendage);

anthers oblong [ovate];

nectar glands lateral, semi-annular, extrastaminal.

sepals 6–10 × 1–1.5 mm;

petals (10–)15–28 × 4–7(–8) mm, (attenuate to claw, 5–12 mm);

filaments 5–10 mm;

anthers 1.2–1.6 mm.

Fruiting pedicels

erect to divaricate, slender.

erect to ascending, 5–12(–16) mm.

Fruits

siliques or, rarely, silicles, sessile, ellipsoid, [linear, oblong, or elliptic], not torulose, terete or latiseptate;

valves each with distinct midvein, pubescent or, rarely, glabrous;

replum rounded;

septum usually complete, sometimes perforate;

ovules 10–40 per ovary; (style persistent);

stigma capitate.

terete or slightly flattened, 0.7–2(–2.8) cm × 2–4(–4.8) mm;

valves: trichomes long-setiform and forked, mixed with smaller, stellate ones;

style 4–12 mm.

Seeds

biseriate, flattened, not winged, ovoid [elliptical];

seed coat not mucilaginous when wetted;

cotyledons accumbent.

1.2–16 × 0.7–1 mm.

2n

= 16.

Aubrieta

Aubrieta deltoidea

Phenology Flowering Apr–Jun.
Habitat Rock crevices
Elevation ca. 1600 m (ca. 5200 ft)
Distribution
from USDA
Europe; sw Asia; nw Africa [Introduced, Calif.]
[BONAP county map]
from FNA
CA; s Europe (Mediterranean region); sw Asia; nw Africa [Introduced in North America]
[BONAP county map]
Discussion

Species 15 (1 in the flora).

Aubrieta is taxonomically challenging and is centered primarily in Greece and Turkey. The delimitation of species is often difficult, possibly because species have resulted from hybridization.

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

Aubrieta deltoidea is known as an escape from the Mt. Hull area at the Mendocino-Lake counties boundary. It is highly variable in its native range, and several infraspecific taxa have been recognized.

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

Source FNA vol. 7, p. 268. Author: Ihsan A. Al-Shehbaz. FNA vol. 7, p. 269.
Parent taxa Brassicaceae > tribe Arabideae Brassicaceae > tribe Arabideae > Aubrieta
Subordinate taxa
A. deltoidea
Synonyms Alyssum deltoideum
Name authority Adanson: Fam. Pl. 2: 420. (1763) (Linnaeus) de Candolle: Syst. Nat. 2: 294. (1821)
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