Eutrema. CRUCIFER.E. 135 



and natural genus of the Old World, distinguished from Sisymbrium by its white 



flowers and characteristic foliage rather than by technical characters. — Fam. 



ii. 418 (the earliest known post-Linnean reference ; the name is ascribed to 



Matthioli by Ruppius) ; DC. Syst. ii. 488; Reichenb. Ic. Fl, Germ. ii. t. 60; 



Prantl, 1. c. 168. [By B. L. Robinson.] 



A. OFFICINALIS, Andrz. Bienuial, hispid-pubescent or quite glabrous : stem tall, terete, often 

 branched above : leaves ovate-deltoid to suborbicular, broadly cordate, sinuate-toothed, 1 to 2 

 inches in diameter, thin and green upon both surfaces, slender-petioled : flowers rather small 

 and crowded: siliques firm, spreading-ascending, tapering at the apex, 1^ inches or more in 

 length, on short stout spreading pedicels. — Andrz. in Marschall v. Bieberst. Fl. Tauro-Cauc. 

 iii. 445 ; DC. Syst. ii. 489. Erijsimum AUiaria, L. Spec. ii. 660. Sisijinhrium Alliaria, Scop. 

 Fl. Carn. ed. 2,'ii. 26 ; Thome',* Fl. Deutschl. ii. t. 289 ; Wats. & Coulter in Gray, Man. ed. 

 6, 72. Alliaria Alliaria, Britton, Mem. Torr. Club, v. 167. — Sparingly naturalized on road- 

 sides near Georgetown, D.C., J. D. Smith, and near New York City, Miss Rich. (Adv. 

 from Eu., Asia.) 



25. EUTR^IMA, R. Br. (Ei!, well, and rp^fxa, an opening ; in the sense of 



well perforated, referring to the often incomplete dissepiment of the capsule.) — 



A small genus of perennials, chiefly of alpine and arctic liabitat, attaining its 



chief development in Siberia, closely related to Sisymbrium but of different habit. 



Leaves entire, crenate, or shallowly dentate, usually ovate, oblong or subrotund, 



often fleshy; the radical ones long-petioled. — R. Br, in Parry, 1st Voy. Suppl. 



to App. 267, t. A, Flora, vii. pt. 1, Beilage 73, & Misc. Works, i. 193 ; Benth. 



& Hook. Gen. i. 78 ; Prantl, 1. c. [By B. L. Robinson.] 



* Septum fenestrate. 



E. Edwardsii, R. Br. 11. cc. Glabrous : root thick, fleshy, perpendicular ; stems one to 

 several, decumbent or nearly erect, 1 to 8 inches high : leaves entire, ovate, mostly rounded 

 at the base and obtusish at the apex ; the radical and lowest cauline upon petioles often two 

 or three times as long as the blade ; the upper cauline sessile or nearly so : flowers small, 

 pale purjde or white, at first densely crowded : fruiting raceme elongated ; pedicels erect or 

 ascending, about 2 lines long : the capsule lance-oblong, about 4 lines in length. — Hook, in 

 Parry, 2d Voy. App. 267, t. A, & Fl. Bor.-Am. i. 67 ; C. A. Mey. in Ledeb. Fl. Alt. iii. 

 163; Ledeb. Ic. t. 258, Torr. & Gray, Fl. i. 112. Smelowskia cinerea, Walpers, Rep. i. 171, 

 in part. Draba (■?) hevigata, Cham. & Schlecht, Linn^ea, i. 25. Sisijnibrium Edwardsii, 

 Trautv. Act. Hort. Petr. i. 59. — Crevices of rocks, Digges Island, Hudson Bay, Bell, to 

 the Arctic Ocean, from Grinnell Land, Greely Exped., to Alaska. (Siberia.) 



E. (?)Eschscholtzianuin, Robinson, n. sp. Root slender, somewhat fibrous-branched, 

 bearing at its apex one or more elongating rhizomes covered with the subulate bases of old 

 petioles : leaves clustered at the ends of the rhizomes, spatulate, long-petiolate, entire, 

 obtuse or rounded ; scapes half inch to two inches high, naked below but bearing just under 

 the inflorescence an involucre of 2 to 4 approximate lanceolate foliaceous bracts : flowers 

 small, corymbose, white ; fruit aseptate ; seeds adhering to the placent.^ long (sometimes 

 months) after the falling of the valves. — Aphrat/imis Eschscholfzianus, Andrz. in DC. Prodr. 

 i. 210. Oreas involucrata, Cham.. & Schlecht. Linnsea, i. 30, t. 1. Brayn Eschscholtziana, 

 Benth. & Hook. Gen. i. 83, ace. to Wats. Bibl. Index, 51.— An interesting and too little 

 known plant growing in loose stony soil, on mountsiins of Unalaska, Chomisso, and in the 

 Aleutian Islands, Andrzejowski. The aflSnities appear to be with the present genus (as 

 suggested by Robert Brown ace. to Hook. Fl. Bor.-Am. i. 68), rather than with Brai/a. 

 Although the iuvolucral leaves are exceptional, satisfactory flower- or fruit-characters for 

 the separation of this species as a monotypic genus have not yet been found. 



* * Septum imperforate. 

 E* ("?) Labradoricum, Turcz. Dwarf, scarcely 2 inches high: stems solitary or several, 

 1-few-flowered, springing from the nodes of an oblique rhizome; leaves entire, ovate. 



