Alyssum simplex Rudolphi

Alyssum (en), Alysson des champs (fr), Alysson simple (fr), Alysson nain (fr), Alysson champêtre (fr)

Species

Angiosperms > Brassicales > Brassicaceae > Alyssum

Characteristics

Herbs annual, (3-)7-25(-35) cm tall, canescent throughout with appressed, coarse, sessile, (3-)5-10-rayed stellate trichomes sometimes with unequal rays. Stems erect, ascending, or decumbent, often several from the base. Cauline leaves subsessile or lowermost attenuate to petiolelike base to 4 mm; leaf blade oblanceolate, obovate-spatulate, or elliptic-lanceolate, (0.5-)0.7-2.2(-3) cm × (1-)2-6(-8) mm, gradually smaller upward, base attenuate, apex acute. Fruiting pedicels divaricate, (2-)3-5(-6) mm, stout, straight, covered with stellate trichomes only. Sepals oblong, 1.7-2.3 × 0.8-1.1 mm, deciduous, with stellate trichomes. Petals pale yellow, oblanceolate, (1.8-)2-2.8(-3.2) × 0.6-0.8 mm, sparsely stellate outside or glabrous, caducous, base attenuate, apex often emarginate. Filaments 1.4-2 mm; median pairs broadly winged, apically 1-or 2-toothed; lateral pair with a broadly winged appendage apically 2-cleft; anthers ovate, 0.3-0.4 mm. Ovules 2 per locule. Fruit orbicular, (3.5-)4-6.5(-7) mm in diam., apex truncate or shallowly emarginate; valves not veined, uniformly inflated at middle, broadly flattened at margin, densely covered with coarse, stellate, equal-or unequal-rayed trichomes; style 0.7-1.6 mm, slender, glabrous or basally stellate. Seeds often 2 per locule, ovate, 1.6-2 × 1.2-1.5 mm, slightly compressed, margined or not. Fl. and fr. Apr-Jun. 2n = 16.
More
Annuals; canescent throughout, trichomes appressed, coarse, (3-)5-10-rayed, rays sometimes unequal. Stems often several from base, usually erect or ascending, rarely decumbent, (unbranched or branched distally), (0.3-)0.7-3(-4) dm. Cauline leaves subsessile or (proximal) attenuate to petiolelike base (to 0.4 cm); blade oblanceolate, obovate-spatulate, or elliptic-lanceolate, (0.5-)0.7-2.2 (-3) cm × (1-)2-6(-8) mm (gradually smaller distally), base attenuate, apex acute. Fruiting pedicels divaricate, straight, stout, (2-)3-5(-6) mm, trichomes stellate (some with unequal rays). Flowers: sepals oblong, 1.7-2.3 × 0.8-1.1 mm, trichomes stellate; petals pale yellow, oblanceolate, (1.8-)2-2.8(-3.2) × 0.6-0.8 mm, base attenuate, apex often emarginate, sparsely stellate-pubescent abaxially or glabrous; filaments: median pairs broadly winged, apically 1-or 2-toothed, lateral pair with broadly winged appendage, apically 2-cleft, 1.4-2 mm; anthers ovate, 0.3-0.4 mm. Fruits orbicular, (3.5-)4-6.5(-7) mm diam., apex truncate or shallowly emarginate; valves uniformly inflated at middle, broadly flattened at margins, densely stellate-pubescent (trichomes coarse, rays equal or unequal); ovules 2 per ovary; style 0.7-1.6 mm, basally stellate-pubescent or glabrous. Seeds ovoid, 1.6-2 × 1.2-1.5 mm, slightly compressed, margined or not. 2n = 16.
Life form annual
Growth form herb
Growth support -
Foliage retention deciduous
Sexuality hermaphrodite
Pollination entomogamy
Spread anemochory
Mature width (meter) -
Mature height (meter) 0.06 - 0.25
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Light 7-9
Soil humidity 3-5
Soil texture 3-4
Soil acidity -
Soil nutriment -
Hardiness (USDA) 4-10

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) 7 - 14
Germination temperacture (C°) 12 - 23
Germination luminosity light
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Habit

Alyssum simplex habit picture by Emmanuel Cosson (cc-by-sa)

Leaf

Alyssum simplex leaf picture by Romero Sánchez (cc-by-sa)
Alyssum simplex leaf picture by Emmanuel Cosson (cc-by-sa)
Alyssum simplex leaf picture by Kaley Jane Nigh (cc-by-sa)

Flower

Alyssum simplex flower picture by Emmanuel Cosson (cc-by-sa)
Alyssum simplex flower picture by Вьюнник Виталий (cc-by-sa)
Alyssum simplex flower picture by Christophe Rollier (cc-by-sa)

Distribution

Alyssum simplex world distribution map, present in China, France, and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:277791-1
WFO ID wfo-0000529874
COL ID 669LF
BDTFX ID 74953
INPN ID 81944
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Alyssum minus f. latifolium Alyssum micranthum Alyssum latifolium Alyssum amoris Alyssum nanum Alyssum campestre var. edentatum Alyssum campestre var. micranthum Alyssum campestre var. micropetalum Alyssum minus var. micranthum Alyssum parviflorum var. edentatum Alyssum parviflorum subsp. edentatum Alyssum parviflorum var. micranthum Alyssum simplex subsp. edentulum Alyssum minus subsp. micranthum Alyssum minus subsp. minus Alyssum campestre var. edentulum Alyssum minus var. minus Alyssum minus f. micranthum Alyssum minus var. mazandaranicum Alyssum simplex