NATURAL ARRANGEMENT. 
1057 
torial line of Cruciferas, about half being found on one side of it, and half on the other. Their station is very 
variable ; many inhabit open sandy places, some form the vegetation about the limits of the perpetual 
snows of lofty mountains, and many follow the footsteps of man through all parts of the world. 
The useful qualities of the turnip, the radish, the rape, and the cabbage, and its multiform varieties, are 
all well known. The greater part of the order consists of plants possessing high antiscorbutic powers. These 
appear to depend upon a certain acrid volatile oily principle, the chemical nature of which is imperfectly 
known. It is particularly abundant in the seeds of mustard and the roots of horseradish, and the leaves of 
Lepidium latifohum, which latter exercise a violent influence upon the organs of digestion. The same 
sort of acrimony, but in less degree, is found in the herbage of the scurvy-grass and the roots of the radish, 
which act much more mildly when taken inwardly ; thus, when any cruciferous plants are found to be eatable, 
either from culture or other circumstances, it is to be understood to depend upon a reduction of this acrid 
principle. The exciting powers of this last, are what render the horse-radish, the scurvy grass, and others, so 
remarkably useful as antiscorbutics ; they are also believed to possess diuretic and diaphoretic properties. It is 
to be remarked, that Crucifera? are always eatable when their texture is succulent and watery, as in the 
roots of the radish and the turnip, and the leaves of the cabbage tribe. A further diminution of the acrid 
principle is produced by blanching. Cruciferae are said to possess a greater share of azote than any other tribe 
of plants ; as is apparent in their fetid smell when fermented. The embryo of ail the order abounds in oil, 
whence many species are employed with much advantage for expressing, either for eating or for feeding 
lamps. Some of the species are extremely beautiful and fragrant, as the Stocks, the Gillyflowers, the Hes- 
perides, the Candytufts, and many others. The Hutchinsias, Drabas, Cardamines, &c. are among the most 
interesting of alpine plants 
Suborder I. PLEVROUmZEM. O 
1381 Mathiola R. Br. 
1382 Cheiranthus L. 
1383 Nasturtium R. Br. 
1384 Leptocarpse'a Dec. 
1395 I>unaria L. 
1396 Ricotia L. 
1397 Farsdtia Turr. 
1398 Berteroa Bee. 
Tribe 1. 
1385 Not6ceras R. Br. 
1386 Barbarea R. Br. 
1387 Brava Stern. 
1389 Turritis R. Br. 
Tribe 2. 
1399 Aubri^tia Adans. 
1400 Vesicaria Lam. 
1401 Al^ssum L. 
ARABIDE.U. 
1390 A'rabis E. 
1388 Parrya R. Br. 
1391 Macropodium R. Br. 
Alyssine^. 
1402 Clyp^'ola W. 
1403 Peltaria L. 
1404 Petrocallis R. Br. 
1392 Cardamine E. 
1393 Pteronenron Dec. 
1394 Dentaria E. 
1405 Draba E. 
1406 Eruphila T>ec. 
1407 Cochlear ia E. 
1408 Thlaspi E. 
1410 Hutch insia R. Br. 
Tribe 3. Thlaspidete. 
1411 Teesdalia R. Br. 
1412 Iberis L. 
1413 Biscutella E. 
Tribe 4. EucLiDiEiE. 
1414 Euclidium R. Br. 1415 Ochth6dium Dec. 
Tribe 5. Anastatice/E. 
1416 Anastatica E. 
Tribe 6. Cakiline^. 
1417 Cakile Tourn. 1419 Chorispora Dec. 
Suborder II. NOTORHIZEM. O 11 
Tribe 7. Sisymbrie.e. 
1420 Malc6mia R. Br. 1422 Sisymbrium E. 1424 Erysimum E. 
1421 H^speris E. 1423 Alliaria Adans. 
Tribe 8. CamelinEjE. 
1425 Camelina Crantx 1426 N^slia Desv. 
Tribe 9. LEPiniNE^. 
1427 Corunopus Sm. 1428 Lepidium E. 1409 Capsella Monch. 1429 iEthionema R. Br. 
Tribe 10. Isatide.e. 
1430 Isitls E. 1431 Myagrum E. 
Suborder III. ORTHOPEOCEM O > > 
Tribe 11. Brassice^e. 
1432 Brassica E. 1434 Moricandia Dec. 1436 Eruca Tourn. 
1433 Sinapis E. 
1437 V^lla E. 
1440 ZSlla Forsk. 
442 Crambe W 
1435 Diplotaxis Dec. 
Tribe 12. Velle^. 
1438 Carrichtera Adans. 
1439 Succowia Monch. 
Tribe 13. Zille^e. 
1441 Calepina Adans. 
Tribe 14. Kapha ne*. 
1418 Rapistrum Desv. 
1443 RSphanus L 
Suborder IV. SPIROEOBEm. O II II 
Tribe 15. Buniadejs. 
1444 Bunias L. 
Tribe 16. Eruca ri;e. 
1445 Erucaria Gcertn. 
Suborder V, DIPEECOEOBEM Oil 1 1 II 
Tribe 17. Heliophile^e. 
1446 Heli6phila L 
3 Y 
