51 
IONOPSIDIUM acaule. 
Stemless Violet- Cress. 
TETRADYNAMIA SILICULOSA. 
Nat. ord. BRassicace=. (Crucirers, Vegetable Kingdom, p. 351.) 
. IONOPSIDIUM, Rchb.—Genus propter radiculam dorsalem a Pleuro- 
rhizeis ritě separatum, certe Lepidineis adsociandum et forsan cum Capsella 
conjungendum, a qua vix satis distinctum videtur.—Meisn. Tabule, p. 13. 
Ionopsidium acaule, Rehb. iconographia, vii. 26. t. 649. 
Cochlearia acaulis, Desfontaines, Flora Atlantica, vol. ii. p. 69. DeCand. 
Syst. ii. 371. Journal of Hort. Soc. vol. i. p. 146. 
Cochlearia pusilla, Brotero, Phytographia Lusitanica, p. 100. no. 45. t. 21. 
figs.2 & 3. 
This charming little annual was received by the Horti- 
cultural Society from the garden of the Duc de Palmella, near 
Lisbon, in Mareh, 1845. "The following account of it has 
been published in the Journal of the Horticultural Society. 
* Tt is found wild, according to Brotero, on the basaltic 
hills near Lisbon, and occasionally on the limestone formation 
of Estremadura. Desfontaines also met with it in Barbary. 
* A beautiful rock plant for shady situations; its flowers 
are of a clear lilae, and the foliage is of a delicate green 
colour. It propagates itself by seeds, and by runners which 
throw out roots abundantly into the damp soil. 
* [t is a hardy little annual, growing in any rich garden 
soil, and blooming from April to October. It requires rather 
a moist (shady) situation. Its small flowers (they come out 
white and turn to a pale lilac) appear in profusion from April 
to October.” It makes a neat edging to borders in shaded 
places, and is a capital rockwork plant. 
DeCandolle considered it a kind of Scurvy-grass, and 
referred it to the genus Cochlearia; but Reichenbach, per- 
ceiving that its radicle lies against the back of the cotyledons 
T 
