Erysimum diffusum Ehrh.

1209(4). Е. diffusum Ehrh., Beitr. Naturk. VII (1792) 157; Hayek, Prodr. Fl. Penins. Balc. 1 (1925) 380; E. canescens Roth, Catal. Bot. 1 (1797) 76; Стоян. Стеф., Фл. Бълг. изд. I, I (1924) 523 — Разклонена боянка

Fam:   Cruciferae Juss. (Brassicaceae)
Genus:   Erysimum L.
Species: Erysimum diffusum Ehrh.
English Name: Diffuse wallflower

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Erysimum diffusum Ehrh. is an accepted name

This name is the accepted name of a species in the genus Erysimum (family Brassicaceae).
The record derives from WCSP (in review) (data supplied on 2012-03-23) which reports it as an accepted name with original publication details: Beitr. Naturk. 7: 157 1792.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:283764-1.

Synonyms:

Erysimastrum canescens (Bory & Chaub.) Rupr.

Synonym

 Date supplied 2012-04-18
From “The Plant List” - www.theplantlist.org/tpl1.1/record/kew-2799981

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Description:

Biennial to a perennial plant. The root is fusiform, branched, with or without short offshoots, ending with sterile leaf rosettes and flower stems. Stems 30 - 120 cm tall, erect, most often branched, less often un branched, ribbed, with two-piece, parallel, longitudinally oriented, lying hairs. The basal leaves, collected in a rosette, filamentous, linear to linear lance, narrowed in a leaf stem, often gyrate, entire or with small teeth apart, most often during the flowering are withered. Lower stem leaves 1 - 20 mm wide, at the base of the stem close, linear lance to linear, entire, to the base narrowed in a short stem, gray or gray-green, with two-piece, adherent, longitudinally directed hairs. The upper stem leaves are sitting down, linear lance, whole end, on top pointed, to the base slightly narrowed, sometimes with short sterile twigs in the bosom, completely covered with two-piece hairs. The inflorescences are dense, grape-like, multiflowery, with prolonged fruit. Flower stems 3 - 6 mm long, straight, ,rolonged by the fruits, fibrous. The leaflets of the calyx 5 - 7 (9) mm long, narrowly oblong, in the upper half with a white tunic strip on the edge, on the top often with a clear little horn, with a convex middle vein, gray fibers, the outer in the base without or with a slight baggy extension. Petals 8 - 13 (16) mm long and 2,5 - 4 mm wide, back ovate, with very long and slim nail, on the underside of fibrous, yellow. Stamens 9 - 10 mm long, The anthers 2 - 3 mm long. The stems of the pods (3) 4 - 7 (9) mm long, deflected, fibrous. The stems are linear, four-legged, (2) 3.5 - 8 cm long and 0,5-1 mm wide, on the back side slightly flattened, on the side very fine gray-fibrous, green on the edges, naked, deviated erect or erect. Caps with a clear centeral vein. The stayle is 0,5 – 1,5 mm long, most often slightly longer than the thickness of the pod. The stigma is a little wider than the style. Seeds oblong, 1 – 1,5 mm long, light brown, smooth.

Volatility

var. diffusum. Biennial plant without shoots. Leaves linear, all-round, often curved, 1 - 8 mm wide. Widespread.
var. moesiacum (Vel.) Stoj. et Stef., Фл. Бълг. изд. 1, 1 (1924) 523; E. moesiacum Vel., Fl. Bulg. Suppl. 1 (1898) 21; E. diffusum var. australe auct. Bulg. non J. Gay. Perennial plantat with shoots. Leaves linear to linear lanceo, toothed, 2 - 10 mm wide. North-East-Bulgaria (Rousse), Prebalkan (Turnovo, Sevlievo), Thracian Lowland (Plovdiv, Chirpan, Haskovo, Asenovgrad, Karlovo).
var. weltschevi (Urum.) Stoj.et Stef., Fl. Bulgarian ed. 1, 1 (1924) 523; Hayek, op. C, 381; E. Weltschevi Urum., Sp. BAS, XVII (1919) 216. Perennial plant with shoots. Leaves up to 20 mm wide, linear, all-round. Black Sea coast (Varna), Prebalkan (Tarnovo), Middle Rhodopes (Bachkovo).

Economic importance. Medical. The seeds contain the cardiac-acting glycosides erizimin and erizimozide and 30 - 40% fatty oil.

From „Флора на НР България”, том IV, БАН, София, (1970)

Flowering Time: Blooms: IV - VI.

References: „Флора на НР България”, том IV, БАН, София, (1970), “The Plant List”

Distribution in Bulgaria: Grow on dry grassy places, along roads, etc. Widespread, up to 1200 m altitude. (Conspectus of the Bulgarian Vascular Flora) = conspectus&gs_l= Zlc.

Distribution: Middle, Eastern and Southeast Europe, Southwestern Asia, Caucasus, Central Asia, Siberia.

Conservation status and threats: not protected species in Bulgaria by the Biodiversity Law. - Biological Diversity Act -    http://eea.government.bg/bg/legislation/biodiversity/zbran_22.08.15.pdf

Medical plant: it is not - Medicinal Plants Act - http://eea.government.bg/bg/legislation/biodiversity/ZLR_en.pdf

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