176 
125. 
126. 
127. 
A. Е. PoRrsILD. 
Though always sporadic in Greenland it is recorded from a good 
many habitats from the interior of the Nordost Bugt. But, so far 
as I can ascertain, it has never been collected far from human 
habitations, and it has most likely been dispersed by man. At 
Ümänaq f. inst. it is very common among the houses together with 
vigorous Puccinellias, which in lieu of Elymus, are frequently 
used for straw in the native boots (kamiks). People travelling from 
Umanag to other places may thus easily disperse both the Arabis 
and the Puccinellia’s. Like Alopecurus alpinus it is a dung-lover. 
A. arenicola (Rich.) Gel. — Kük, Patorfik and Pätüt. 
Braya purpurascens (В. Br.) Bunge. — Qaersuarssug, Pätüt and Ata. 
Eutrema Edwardsi В. Br. — Как, Qaersuarssuk, Qeqertarssuak 
71°30’, Svartenhuk Peninsula at 71°22’ and the interior at 71°40’. 
From Qaersuarssuk I collected five living specimens in order to 
cultivate them at the Danish Arctic Station. On July 29th all the 
specimens had finished flowering. Apparently they stood the voyage 
well and on my return to Godhavn three weeks later they were 
planted in a Cassiope tetragona heath in “Bleesedalen” on a suitable 
place where humidity, insolation and the deposition of snow during 
winter resembled the original habitat. 
Some days later I observed that several of the pods had opened 
and the valves fallen off. On one of them only the valves were still 
adhered, and, to my surprise they had opened at the top of 
the siliqua. As all standard works on systematic Botany to which 
I have had access without exception state as an invariable rule 
that amongst the Cruciferæ the valves open from the base, I think 
it best to call attention to this abnormality although I have only 
seen it once on one living specimen, but I have also noticed it — 
on four herbarium specimens: Svartenhuk, Tartüssaq, 1911, Por- 
sild (in the Herb. of The Danish Arctic Station). Lapponica pono- 
jensis, Orlow, 67°12’, Kihlman; Qaersuarssuk, 29th Juli 1921, 
A. E. Porsild; Duckett Cove, Parry, 1823 (in Herb. Haun.). 
The last mentioned specimen is probably the type. In RoBERT 
Brown’s figure (App. XI. Parry Voy. I. tab. A. figs. 16 and 17, 
drawn by Fr. BAUER and engraved by J. Curtis) the pods are 
shown opening from the base, but in the text Brown does not 
mention the dehiscense; he only says: “valvae . . . cortice demum 
ad margines solubile, in disco arctius adherenti...” Fl. Dan. 
Tab. 2242 shows a silique slightly opened in the top. But, the 
drawing being bad, it can hardly be ascertained whether this was 
accidentally or actually seen so by the designer. 
In 1922 my specimens in “Blesedalen” had died, but the seeds 
had germinated and given rise to several seedlings around the 
