Rather common on the low islets gi-own ^\ ilh brush-woofl in the Yenisei, near Ust 

 Abakansk, where taken by me in full flower at the beginning of June. The specimens are 

 completely glabrous. 



Distribution: Europe, except the extreme north, Caucasia and south-western Asia 

 lo the Thian-Shan, eastern Turkestan, Tibet and the Himalayas, southern Siberia to 

 Lake Baikal, southern Mongolia. 



Nasturtium pahistre DC. Syst. II (1821) p. 191; Ledeb. Fl. Alt. Ill, p. 8: Turczan. 

 Cat. Baical. no. 104; Ledeb. H. Ross. I, p. 112; Turczan. Fl. Baical.-Dahur. (1842) p. 226, 

 no. 99; Regel, PL Radd. (1861) p. 151, no. 173; Kpuj. lu. A.n . I (1901) p. 64; Byun,, Crucife 

 me wh (I>.T. Ciioiip. II ^a.TbH. Boot. II (1915) p. 201. Nasturtium densiflorum Turczan. Cat. 

 Baical. no. 105; Turczan. Fl. Baical.-Dahur. (1842) p. 226, no. 100. 



It appears from the material collected that the species varies considerably, espe- 

 cially in the shape and size of the silicic and the form and incisions of the leaves. The ter- 

 minal lobe of the leaf is always comparatively small, narrowly triangular in outline, and 

 tapering towards the summit, by which characters all the Siberian specimens in my col- 

 lections are distinguished. The auricles vaiy much in size, and so do the petioles in 

 length. In many specimens the upper cauline-leaves are also markedly petioled. The 

 sepals in the Siberian specimens are frequently furnished with rather long, white, 

 intricate hairs, which is an especially predominant character in the quite young flower- 

 buds. Such hairy sepals are to be found in some Scandinavian specimens as well, but 

 not so commonly or so predominantly as is tlie case in the Siberian ones. A similar 

 hairiness may also occur in the auricles, and, exceptionally, along the greatest nerves 

 of the leaves. As for the rest, the plants are completely glabrous. The species is very 

 common in the Minusinsk district, where collected on swampy river-banks, along the 

 Yenisei and Abakan rivers, on islets in the said rivers, near Kushabar, and on the 

 banks of the river Amyl, on the Sisti-kem, and at Ust Tara-kem. The species begins 

 flowering here in the first half of June. 



Distribution: Nearly all over Europe. Caucasia, south-weslern Asia, Turkestan, 

 Siberia, the Himalayas, India, Mongolia, eastern Asia, Sakhalin, Jajian, North .Vfrica, 

 America, Greenland, New Zealand. 



Armoracia sisynibrioides (DC.) Cajaud. AUuv. (190a) p. 33; Fiyiuh, Cruciferne wh 

 i\i. Ciir)ii|i. II ,lu.ibii. BocT. H (1915) p. 219. Cochlearia sisynibrioides DC., Ledeb. Fl. Hoss 1, p. 

 158; Kpbi.i. $.1. A.iT. I (1901) p. 86. Cochlearia g rand i flora DC, Turczan. Cat. Baical. 

 no. 148; Turczan. Fl. Baical.-Dahur. (1842) p. 261. no. 140; Ledeb. Fl. Ross. I, p. 159; 

 Regel, PI. Radd. (1861) p. 200, no. 223. 



Scattered on tlie islets in the river Abakan, especially in moist, grass-grow n fields, 

 near stagnant water; with flowers and young fruits in the middle of June. 



Distribution: Southern Siberia, from the government of Tobolsk to Trans Baikal 

 to the east, Sakhalin. 



260 



