38 CRUGIFER^E. [THLASPI. 



Fields, &c. rather common ; rarer in Scotland ; east of Ireland ; a colonist, 

 Watson; fl. May-July. Stem 1-2 ft., usually simple, slender, erect. Jt<li- 

 cal leaves petioled, cauline with prominent auricles. Flowers in. diam., 

 white. Pods ^-jj in. diam., flat, on slender spreading pedicels, disposed in 

 long racemes. Wings with a delicate marginal nerve, lobes sometimes over- 

 lapping at the tip ; style very short ; seeds dark, oblong, ridged and punc- 

 tate. DISTBIB. Europe to N. Africa, N. and W. Asia to N. W. India ; iutrod. 

 in U. States. 



2. T. perfolia turn, L. ; annual, cauline leaves cordate with converging 

 auricles, pod small obcordate, valves winged above, cells 4-6 seeded. 

 Limestone pastures, rare ; Oxford and Gloucestershire ; fl. April-May. Much 



branched from the base ; branches 4-6 in. , ascending, flexuous. Leaves 

 -1 in. broad; radical spathulate, petioled. Flwei-s A in. diam., white. 

 Po<.ls in., and pedicels horizontal ; valves turgid, wings short with a stout 

 marginal nerve ; style very short; seeds pale. DI.STUIB. Mid. and S. Europe, 

 N. Africa, N. and W. Asia. 



3. T. alpes tre, L, ; perennial or biennial, canline leaves sagittate, 

 pods obcordate retuse, valves winged above, cells 4-8-seeded. 



Mountain districts, England and Scotland, ascending to 2,500 ft. in Forfar- 

 shire ; fl. June- Aug. Stem 6-10 in. Radical leaves long-petioled, obovate, 

 entire ; cauline ^ in. Flower | in. diam. Racemes of pods variable. Pod 

 ^ in., curved upwards, on spreading pedicels, longer than in the preceding 

 species, and more narrowed at the base ; wing with an obscure marginal 

 nerve; seeds red-brown. DISTRIB. Europe, Himalaya. I do not find that 

 authentically named specimens of the following sub-species altogether tally 

 with the characters assigned to them. 



Sub-sp. SYLVES'TRE, Jord. (sp.) ; notch of pod shallow, style as long as its 

 lobes. Teesdale, Allen river, Northumberland ; Glen Isla, Scotland. 



Sub-sp. OCCITA'NDM, Jord. (sp.); notch of pod shallow, style .slender longer 

 than its lobes, radicle at times incumbent (Syme). Limestone rock.s, Settle, 

 Yorkshire and Llanrwst, N. Wales. 



Sub-sp. VI'RENS, Jord. (sp.); notch of pod minute, style slender much ex- 

 ceeding it. Limestone rocks, Matlock. 



19. IBERIS, L. CANDY-TUFT. 



Low, glabrous, branched, leafy herbs, often shrubby below. L> .'?-..> 

 entire or pinnatind, often fleshy. Flowers corymbose, all or the outer only 

 with the 2 outer petals radiating. Sepals equal at the base. Petals white 

 or lilac, the two outer much the longest. Filaments without appendages. 

 Pod broad, much compressed, orbicular or ovate, tip entire or notched ; 

 valves keeled or winged; septum very narrow, of two lamellae; stigma 

 notched. Seeds 1 in each cell, not margined ; cotyledons accumbent ; 

 radicle horizontal or ascending. DISSTRIH. Mid. and S. Europe, Asia 

 Minor ; species about 20. ETYM. Iberia (Spain), where many species grow. 



1. I. ama'ra, L. ; leaves oblong-lanceolate, pods suborbieular. 

 Cornfields and cultivated ground on a dry soil, chiefly in the centre and E. 

 of England, rare in Scotland ; a colonist, \\'<'t.i ; ft. July-Aug. Animal. 

 Stem, 6-9 in., erect, corymbosely branched, ribbed, the rilis minutely downy. 

 Leave* 1-3 in., sessile, scattered, sparingly toothed or pinnatind, often minutely 

 ciliate. Flowers \-\ in. diam., white or purplish. Pods J in. broad, flat, on 



