GENUS 28 



MUSTARD FAMILY. 



i. Conringia orientalis (L.) Dumort. 



Hare's-ear, Treacle Mustard. 



Fig. 2061. 



Brassica orientalis L. Sp. PI. 666. 1753. 

 E. perfoliatum Crantz, Stirp. Aust. I : 27. 1762. 

 Brassica perfoliata Lam. Encycl. i: 748. 1783. 

 Erysimum orientate R. Br. Hort. Kew. Ed. 2, 4 : 



117. 1812. 



Conringia perfoliata "Link, Enum. 2: 172. 1822. 

 C. orientalis Dumort. Fl. Belg. 123. 1827. 



Stem usually erect, simple, or somewhat 

 branched, i-3 high. Leaves light green, 

 obtuse at the apex, 2'-$' long, i'-2' wide, the 

 upper smaller; racemes at first short, much 

 elongating in fruit ; pedicels slender, ascend- 

 ing, 4"-8" long; petals about 4' long; nearly 

 twice as long as the sepals ; pods 3'-$' long, 

 about i" wide, 4-angled, spreading. 



In waste places, New Brunswick to Manitoba, 

 Oregon, Delaware, Missouri and Colorado. A bad 

 weed in the Northwest. May-Aug. 



29. HESPERIS [Tourn.] L. Sp. PI. 663, 1753. 



Erect perennial or biennial herbs, pubescent with forked hairs, with simple leaves and 

 large racemose purple or white flowers. Stigma with 2 erect lobes. Siliques elongated, nearly 

 cylindric, the valves keeled, dehiscent, i-nerved. Seeds in I row in each cell, globose, wing- 

 less; cotyledons incumbent. [Name from Hesperus, evening, when the flowers are most 

 fragrant.] 



About 25 species, natives of Europe and Asia. Type species : Hesperis matronalis L. 



i. Hesperis matronalis L. Dame's Rocket 

 or Dame's Violet. Fig. 2062. 



Hesperis matronalis L. Sp. PI. 663. 1753. 



Erect, simple or sparingly branched above, 2-3 

 high. Lower leaves 3'-8' long, tapering into a 

 petiole, ovate or ovate-lanceolate, acute, dentate 

 with minute teeth, pubescent on both sides; upper 

 leaves similar but smaller, sessile or short-petioled ; 

 flowers 8"-i2" broad, pink, purple or white, fra- 

 grant; blade of the petals widely spreading, about 

 as long as the claw; pods 2'-4' long, spreading or 

 ascending, contracted between the seeds when ripe. 



In fields and along roadsides, escaped from gar- 

 dens, Nova Scotia to Ontario, Pennsylvania and 

 Iowa. Native of Europe and Asia. May-Aug. Old 

 English names are Queen's- or Dame's-gillinower ; 

 night-scented, rogue's- or winter-gilliflower. Dam- 

 ask-violet. Sweet-rocket. Summer-lilac. 



30. ARABIDOPSIS (DC.) Schur. 



Enum. PI. Trans. 55. 1866. 

 [PiLOSELLA (Thai) Kostel. Enum. Hort. Prag. 104. Hyponym. 1844.] 



[STENQPHRAGMA Celak. Flora 55 : 438. 1872.] 



Annual or perennial herbs with the aspect of some species of Aral/is, pubescent with 

 forked hairs, with branched slender erect stems, entire or toothed leaves and small white or 

 pink flowers in terminal racemes. Style very short; stigma 2-lobed. Siliques narrowly linear, 

 the valves rounded, nerveless or finely nerved, dehiscent. Seeds in i row in each cell in the 

 following species, in some European species in 2 rows; cotyledons incumbent. [Named from 

 its resemblance to Arabis.] 



About 12 species, natives of Europe, Asia and North America. Type species : Arabis Thaliana L. 

 Annual ; introduced weed. i. A. Thaliana. 



Perennial ; indigenous. 2, A. novae-angliae. 



