Herbarium specimen: Diplotaxis muralis
| Taxon: | Brassicaceae: Diplotaxis muralis (L.) DC. ("Annual Wall-rocket") |
|---|---|
| Filed in taxon folder: | Brassicaceae: Diplotaxis muralis (L.) DC. ("Annual Wall-rocket") |
| Collected by: | Mr Joseph Edward Little |
| Collection date: | 29/10/1932 |
| Locality: | Great Britain, VC20 Hertfordshire, Hitchin, TL12 |
| communicated: | Mr Harold Stuart Thompson |
| exchanged: | Watson Botanical Exchange Club |
| Institution: | University of Birmingham (BIRM) |
| Image: |  |
| fruits/flowers: | seeds/fruits |
| notes: | a. "19. Fine. A biennial or sub perennial form sometimes mistaken for D. tennuifolia. V W White" b. Extract: "Diplotaxis muralis DC. B. Babingtonii (Syme) [922]. Hitchin, Herts., October 29 1932. J. E. Little. This is D. muralis DC. var. intermedia (Schur. pro sp.) which com¬prises the taller, stouter and more leafy of the plants usually called var. Babingtonii. I have had similar plants from Oxfordshire and Derbyshire.—E. Drabble. Diplotaxis muralis was noted as rare in Webb and Coleman’s Flora Hertfordiensis (1869), but during the last century it has much extended its range in North Herts., travelling along the railways, and is now frequently to be found on ballast, in waste places and on arable fields. The over-winter plant, which received the name var. Babingtonii (Syme), is now not infrequent. Ascherson and Graebner remark that this form changes habit considerably, loses the basal rosette, and becomes much-branched and luxuriant. It thus simulates the habit of D. tenuifolia, and the length of the pedicel of a ripe siliqua is sometimes as much as 18 mm. to a pod of 32 mm., or 16 : 28, not at all corres¬ponding to book descriptions. The flowers of D, tenuifolia become much smaller at the end of the season, not greatly different in size from those of D. muralis. A useful contrasting character is given by Asch. and Graebn. viz., D. tenuifolia: siliqua shortly stiped above the scar of the calyx. D. muralis ; siliqua without stipe, D. tenuifolia DC. Aldeburgh, September, 1928, - Leg. K, D, Little. Pod with stipe and style up to 34 mm. (or 32 mm, or 20 mm.). Pedicel tip to 22 mm. Stipe 1.0 mm. Flowers relatively small, 6-0 mm. long. (Hooker gives, pods 1/3 - ½ in,) – J E Little." |
| Filing note: | Diplotaxis muralis var babingtoni |
Inferred details are marked.
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Documented by mikedaps on 7th October 2009.
