Genus 2. 



MUSTARD FAMILY. 



153 



2. BERTEROA DC. Mem. Mus. Paris, 7: 232. 1821. 



Annual or perennial licrbs, stellate-pubescent or cancscent, the leaves mostly narrow 

 and entire, and the Howers white in terminal racemes. Petals 2-cleft. Filaments 2-toothed 

 at the base. Silicles oblong or subglobose, somewhat compressed. Seeds several in each cell, 

 winged. Cotyledons accumbent. [In honor of C. G. Bertero, a botanist of Piedmont, 

 1739-1831-] 



About 5 species, natives of Europe and Asia, the following tj-pical. 



I. Berteroa incana (L.) DC. Hoary Alvssum. 

 Fig. 2010. 



Alyssum tncaniim L. Sp. PL 650. 1753. 

 Berteroa incana DC. Syst. 2: 291. 1821. 



Erect or ascending, i-2 high, hoary-pubescent, 

 branching above. Leaves lanceolate or oblong, \'-i 

 long, obtuse, entire or slightly undulate, the lower nar- 

 rowed into a petiole; flowers white, i"-ii" broad; 

 pedicels ascending, 2"-3" long in fruit ; pod cancscent, 

 swollen, oblong, 3"-4" long and about half as broad; 

 style l"-lj" long; stigma minute. 



In waste places. Maine to Ontario. Minnesota, Massa- 

 chusetts, New Jersey and Missouri. Adventive or natural- 

 ized from Europe. Racemes elongating, the flowers and 

 pods very numerous. June-Sept. 



Berteroa mutabilis (Vent.) DC, also native of Europe, 

 has a more compressed, sparingly pubescent and slightly 

 larger pod ; it is recorded as adventive in Massachusetts. 



3. KONIGA^^ Adans. Fam. Fl. 2: 420. 1763. 



[LouuLARi.\ Desv. Journ. Bot. 3: 172. 181 3.] 



Perennial herbs or shrubs, pubescent or canescent with forked hairs, with entire leaves, 

 and small white flowers in terminal racemes. Petals obovate, entire. I-'ilaments slender, 

 not toothed, but with two small glands at the base. Silicle compressed, oval or orbicular. 

 Seeds i in each cell. Cotyledons accumbent. [Name in honor of Charles Koiiig, a curator 

 of the British Museum.] 



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



I. Koniga maritima (L.) R. Br. Sweet 



Alyssum. Seaside Koniga. Madvvort. 



Snow-drift. Fig. 201 1. 



Clypeola marilima L. Sp. PI. 652. 1753. 

 Alyssum- maritinium Lam. Encycl. i; 98. 1783. 

 Koniga maritiiua R. Br. in Denh. & Clapp. Narr. 

 '/I Exp. Afric. 214. 1826. 



Procund)ent or ascending, freely branch- 

 ing, 4'-i2' high, minutely pubescent with 

 appressed hairs Stem-leaves nearly sessile, 

 lanceolate or linear, -2 long, i"-22" wide; 

 basal leaves oblanceolate, nrrowed into a 

 petiole, flowers wdiite, frr.grant, about 2" 

 broad ; pedicels ascending, 3"-4" long in 

 fruit ; pods glabrous, pointed, oval or nearly 

 orbicular, l"-ii" long; caly.x; deciduous; 

 stamens not appendaged. 



In waste places, occasional. V'ermont to Penn- 

 sylvania and on the Pacific Coast. Bermuda. 

 Cuba. Escaped f-om rjardens. Adventive from 

 Europe. Sweet allison. Summer. 



4. ALYSSUM [Tourn.] L. Sp. PI. 650. 1753. 

 Low branching stellate-pubescent annual or perennial herbs, with small racemose yellow 

 or yellowish flowers. Petals entire. Filaments often dilated and toothed or appendaged. 

 Silicle ovate, oblong or orbicular, compressed, its valves nerveless, the septum thin. Stigma 



* Originally spelled Konig. Latinized by R. Brown in 1826. 



