148 



BEASSICACEAE. 



1. Thlaspi arvense L. 



FIELD PENNY-CRESS. (Fig. 

 170.) Annual, glabrous, 6'-20" 

 high. Basal leaves petioled, 

 oblauceolate, early deciduous ; 

 stem-leaves oblong or lanceo- 

 late, sparingly dentate, the 

 upper clasping the stem by an 

 auricled base; flowers white, 

 about \" broad; pedicels spread- 

 ing or curved upward, slender, 

 5"-10" long in fruit; pods 

 nearly orbicular, 4"-6" broad, 

 very flat, broadly winged all 

 around, notched at the apex, in 

 long racemes; style minute, or 

 none ; seeds about 6 in each cell. 



Cultivated grounds, Agricul- 

 tural Gardens, 1911. Introduced. 

 Native of Europe and Asia. 

 Widely naturalized in North 

 America. Flowers in spring. 



4. KONIGA Adans. 

 Perennial herbs or shrubs, 

 pubescent or canescent with 

 forked hairs, with entire leaves, 

 and small white flowers in terminal racemes. Petals obovate, entire. Fila- 

 ments slender, not toothed, but with two small glands at the base. Silicle 

 compressed, oval or orbicular. Seeds 1 in each cell. Cotyledons accum- 

 bent. [Name in honor of Charles Konig, a curator of the British Museum.]. 

 About 4 species, natives of the Mediterranean region, the following typical. 



1. Koniga maritima (L.) 

 E. Br. SWEET ALYSSUM. SEA- 

 SIDE KONIGA. (Fig. 171!) Pro- 

 cumbent or ascending, 4'-12' 

 high, minutely pubescent. Stem- 

 leaves nearly sessile, lanceolate 

 or linear, i'-2' long; basal 

 leaves oblanceolate, narrowed 

 into a petiole ; flowers fragrant, 

 about 2" broad; pedicels 3"-4" 

 long in fruit; pods glabrous, 

 pointed l"-li" long; calyx de- 

 ciduous; stamens not append- 

 aged. [Clypeola maritima L. ; 

 Alyssum maritimum Lam.] 



Frequent on roadsides and in 

 waste grounds. Escaped from 

 flower gardens and naturalized. 

 Native of Europe. Escaped from 

 cultivation in the United States. 

 Flowers from spring to autumn. 

 Much planted in garden borders. 



