vi. crucifeexE: brassiceas. 
41 
Sinapis. ] 
strong grounds for considering all to be varieties, as they scarcely 
dili'er in other respects. 
** Valves of pod 3- nerved beak 1 — 3- seeded . 
5. B. Monensis Br. ( Isle-of-Man or Wallflower C .) ; leaves 
stalked all deeply pinnatifid, lobes oval oblong unequally 
toothed, in the upper ones linear. — a. steins prostrate glabrous 
or hispid at the base. Sisymbrium L. : E. B. t. 962. — (3. stems 
erect more leafy and hispid. B. cheiranthus Vill. Sinapis Koch : 
E. B. S. t. 2821. 
0. on the isles and shores of the Clyde, and on both sides of the 
Irish Channel, Argyleshire, Ayrshire, &c. ; Isle of Man. — j8, S. 
Wales, Jersey. I). 5 — 8.- — Leaves usually glabrous, except on the 
petioles. Stems slightly hispid, greedily eaten by sheep and cattle, and 
probably deserving of being cultivated as fodder. 
29. Sinapis Linn. Mustard. 
Pod 2-valved (with a sterile, or one- or several-seeded beak). 
Seeds in a single row. Cal. patent. — Named from the Greek 
aivairi, the common mustard , which again Tlieis derives from the 
Celtic nap (modern Gaelic neup ), a turnip. 
* Valves of pod l-nerved. 
1. S. nigra L. (common M.) ; pods adpressed glabrous tetra- 
gonous, beak sterile short subulate, upper leaves linear-lanceo- 
late entire glabrous. E. B. t. 969. Brassica Boiss. : Beuth. 
Under hedges and in waste places, in England, very rare in Scot- 
land (if wild). 0 6 — 9. — Stem 3 — 4 feet high. Lower leaves 
large, lyrate, rough. Pod with a short empty beak, or rather only the 
persistent style and stigma at its summit; its valves bluntly but so 
strongly ] -nerved as to make it quadrangular, the four sides being 
fiat and without any prominent veins. — The seeds yield the mustard 
of our tables ; of which the best is that from which the oil has been 
expressed, as originally prepared by Mrs. Clements of Durham. 
2. S. incana L. ( hoary M.) ; pods adpressed terete promi- 
nently veined with a short 1 -seeded beak, leaves lyrate hispid, 
cauline ones linear-lanceolate, stem much branched. Eru- 
castrumifoc/i : E. B. S. t. 2843. Brassica adpressa Boiss. : Benth. 
Jersey and Alderney, but rare. £. 7, 8. — Pods glabrous or 
hairy, with a glabrous beak and single seed. Seeds ovate, com- 
pressed ; on which account it has been removed to the genus Eru- 
castrum, but it is less allied to Brass. Erucastrum, the type of that 
genus, than to Sin. nigra. 
** Valves of pod 3 — 5 -nerved. 
3. S. arvensis L. (wild M., Charlock ); pods glabrous with 
many angles turgid and knotty longer than the slightly com- 
