236 



NATURAL HISTORY OF PLANTS. 



{Central and Southern Europe, Temperate Asia, Mountains of North 

 and Tropical Africa, Temperate North and South America 1 ). 



22. Conringia Reichb. 2 — Sepals elongated erect; lateral some- 

 times more or less saccate at base. Petals long-unguiculate. Flowers 

 otherwise of Sisymbrium or Erysimum. Siliqua 3 often large linear 

 elongated, either compressed or 4-gonous. Style short or elongated 



most difficult of all. From Brassica (sect. 

 E/ttcastrum) it differs only in its flat cotyledons ; 

 from Conringia only in its leaves (S. fugax 

 La&asc., from Spain, has the clavate style of 

 C. clavatum). The stigma of S. pannonicum 

 shows the two erect lobes of Malcolmia. S. 

 supinum L. has manifestly 2-seriate seeds, as is 

 common in Braya. In S. pusill/u/m Hook. 

 (referred by various authors to Draba, Erysimum, 

 and Arabis) the radicle is oblique. S. sophioides 

 (a variety of S. Sophia) shows the subumbellate 

 inflorescence of Thelypodium. Many sections 

 have been proposed in Sisymbrium, but the dis- 

 tinctions between most are very difficult. The 

 following are the best we could make, though 

 not strictly denned." (B. H., loc. cit.) Adding 

 the species of Eutrema and Braya, we get the 

 following 12 sections : — 



1. Norta DC. (Prod?'., i. 191, sect. ii.). Siliquas 

 subterete, spreading ebracteate pedicellate. Seeds 

 1-seriate. Petals yellow or yellowish white. 

 Sepals spreading. (Reich., Ic. Fl. Germ., ii. t. 

 80.) 



2. Irio DC. (inch Descurea DC. — Descurainia 

 Webb, Phyt. Canar., 72. — Pachypodium Webb, 

 op. cit., 75. — Hugueninia Reichb., op. cit., t. 

 81. — Tonguea Endl., Gen., n. 4905. — Lepto- 

 carpcea DC, Syst. Veg., ii. 201). Fruit of Norta. 

 Petals yellow. Sepals erect. 



3. Velarum (DC, sect. i. — ChamcEplium Spach, 

 Suit, a Buffon, vi. 433). Siliquas subspicate 

 ebracteate, appressed to rachis, subulate. Flowers 

 yellow. (Reicub., op. cit., ii. t. 72.) 



4. Arabidopsis (DC, sect. vi.). Siliquas brac- 

 teate or ebracteate, pedicellate, spreading or erect, 

 nearly fiat, rarely subalate. Seeds 1-seriate. 

 Sepals spreading or erect. Petals white, pink, or 

 purplish. (Reichb., op. cit., ii. t. 60 [Conringia].) 



5. Drabopsis (C Koch, in Linncea, xv. 253). 

 Seeds 2-seriate. Other parts of Norta (Reichb., 

 op. cit., ii. t. 72. — Walp., Rep., ii. 760). 



6. Braya (Steknb. & Hoppe, Diss., ex DC, 

 Syst., ii. 210 j Prodr., i. 141. — Endl., Gen., u. 

 4912. — Hook, p., in Journ. Linn. Soc, v. 168. — 

 B. H., Gen., 82, n. 70.— Foubn., in Bull. Soc. 

 Bot. de Fr„ x. 5. — Platypetalum R. Be., in 

 Parr. Voy. App., 266). Siliqua ovate, oblong or 

 linear, sub-compressed or subterete, rarely globose; 

 valves 1-veined or ribbed. Seeds 1- or more often 

 2-seriate, few or 0. — Csespitose herbs; flowers 



shortly racemose or subcorymbose, sometimes soli- 

 tary ; petals white, pink, or purple. (Spec, about 

 12, from all Frigid and Arctic Regions. Reichb., 

 op. cit., ii. t. 56. — Wedd., Chlor. Andina, i. t. 85. 

 — Walp., Rep., i. 171, 174 {Platypetalum) ; ii. 

 761.) 



7. Eudema (H. B., PL Mqv.in., ii. 133, 1. 125). 

 Flowers of Braya; septum perforate. Scape 

 sometimes 1-fiowered. (Walp., Rep., v. 41.) 



8. Oreas (Cham. & Schltl., in Linncea, i. 29, 

 t. 1. — Aphragmus Andbz., in DC. Prodr., i. 

 209. — Orobium Reichb., Consp., 185). Flowers 

 of Braya ; septum 0. 



9. Kibera (DC, loc. cit., 194, sect. v.). Siliquas 

 axillary or bracteate; seeds 1, 2-seriate. (Reichb., 

 op. cit., ii. t. 73.) 



10. Psilostylum (DC, sect. in.). Siliquas sub- 

 terete ; style slender. Calyx closed. Petals 

 yellow. (Deless., 1c. Sel., ii. t. 63, fig. 1.) 



11. Alliaria (Adans., Fam. des PI., ii. 418.— 

 DC, Syst. Veg., ii. 488; Prodr., i. 196.— Spach, 

 Suit, a Buffon, vi. 413. — Endl., Gen., 875). 

 Siliqua elongated. Flowers white. Leaves entire, 

 cordate or deltoid. Seeds striate. Species 2, 1 

 Himalayan, 1 European and Asiatic. ((Ed., Fl. 

 Dan., t. 935. — Scor., Fl. Carniol., 515. — 

 Reichb., op. cit., ii. t. 60.) 



12. Eutrema (R. Be., in Parr. Voy. App., 267, 

 t. A. — Endl., Gen., n. 4924. — Hook, f., in 

 Journ. Linn. Soc, v. 164. — B. H., Gen., 78, n. 

 50). Siliqua linear oblong terete ; valves convex 

 costate. Seeds few. Perennial herbs ; stem3 

 simple, few-flowered ; flowers subcorymbose 

 (white); radical leaves long-petiolate, oblong or 

 cordate, entire or serrate ; cauline subsimilar or 

 sessile. (Spec. 5, 3 Siberian and Arctic, 2 from 

 mountains of Asia. Ledeb., Ic. Fl. Ross., t. 

 258.— Walp., Rep., i. 174.) 



1 Spec, about 90. Deless., Ic. Sel., ii. t. 63, 

 64.— Foebn., Thes. Cit., 54.— Boiss., Fl. Or., 

 i. 212 (Alliaria), 213.— Tbiana & Pl., in Ann. 

 Sc Nat., ser. 4, xvii. 63. — Eichl., in Mart. Fl. 

 Bras., Crucif., 303. — Gkiseb., Fl. Brit. W. 

 Ind., 13. — Geen. & Code., Fl. de Fr., i. 92. — 

 Walp, Rep., 163; ii. 760; v. 39; Ann., i. 40; 

 ii. 48 ; iv. 209 ; vii. 133. 



- Ic. Fl. Germ., ii. t. 61 (part.). — Endl., 

 Gen., n. 4908 e .— B. H., Gen., 78, n. 51. 



3 Very variable in form, and usually a de- 

 ceptive character. 



