IDG TETRADYN. SILICUL. 



3. C. danica {Dnnish SciLrvy-grass), pouch ovato- elliptical, 

 leaves all petiolate deltoid. Lightf. p. 343. E. B. /.697. 



Hab. Rocks and sandy or stony places on the sea-coast. Burntisland 



and Cramond island on the Firth of Forth, Maugh. Both on the E. 



and W. coast ; sands at Peterhead ; i^i Arran, &c., Mr. Murray. 



F/. May. 0. 

 Stems -i — (i inches long, branched. Leat^fs sometimes lobed and sinuated, 



sometimes nearly entire. Foiiclies reticulated, at least in a dry state. 



4. C. Armoracia (Horse-radish), pouch oblong, stigma dilated 

 nearly sessile, radical leaves oblong (on long footstalks) crenate, 

 cauline ones elongato lanceolate serrate or entire. Lightf. 

 p. 1130. E.B. if. 2323. 



Hab. Mentioned as a native by Sibbald. Field near Craigcrook, 

 Maugh. Waste ground about Glasg., occasionally, Hopk. Dud- 

 dingston Loch, Mr. Arnott. Fl. May. 1/ . 



Roots long and running deep into the ground, well known at our ta- 

 bles, and admired for its pungent flavour. Stoiis 1^ foot to 2 feet 

 high, branched, striated. Leaves much veined. Flowers white. 

 Fruit seldom perfected, compressed. 



8. SUBULARIA. 



1, S. aqjiaiica (Jwl-wort). Lightf. p. '6?>1 . E.B. 1.132. 



Hab. Margins of the Highland lakes, under the water, in a gravelly 

 or sandy bottom, as in Loch Tay, Sic, Dr. Sluart. Loch of Clunie, 

 Rev. Mr. M' Ritchie. Loch Lomond, by Inch Tavannoch, I\Ir. Dorrer 

 and Hook. Ft. .July. 1/ . 



Leaves few, radical, awl-shaped, an inch or more long, recurved at the 

 extremity. Scape 2 — 3 inches high. Flower small, white, said to pro- 

 duce and to perfect the fruit entirely under water. 



9. DRABA. 



1. Dr. verna {common Whitlow -grass), scapes naked, petals bi- 

 partite, leaves lanceolate somewhat cut hairy. Br. Lightf. 

 p. 837. E. B. ;. 586. 



Hab. Walls, rocks, and dry hills. F/. March— May. 0. 



Two to 4 inches high. Pouches ovate. Floivers white. Hairs of the 



leaves more or less forked, or stellated, as they are on all the British 



species of Draba. 



2. Dr. nipestris {Rock Whitlow-grass), scapes naked or with one 

 leaf, petals undivided, pouch lanceolate pubescent, leaves 

 plane lanceolate hairy. Br. E. B. t. 1338 (D. hirta, but not 

 of Linn, or Fl. Dan. according to Brown). 



Hab. Nat. of Scotland, Brown in Hort. Kew. Ben Lawers, Mr. Dick- 

 so-n. F/. July. 11. 



I am not acquainted with tliis species. Smith says that it is from one 

 inch to three inches high, round, more or less hairy, naked, or with 

 an occasional leaf at the bottom ; that all the hairs are quite simple, 

 in which particular it differs from Dr. stellata of Jacq. ; and that the 



