59 



B. Choripetalae. 

 Order XVII. CALLITRICHACEAE. 



58. Callitriche hamulata Kiitz. 



Conimon on thc Islands in (iitches and pools of water in the lower 

 districts; grows to a height of about 200 m. Landforms with linear 

 leaves are most frequent, but liere and there aquatic forms with floating 

 leaves, spatulate, in a rosette are also found. 



In my list (Ostenf. III. p. 140) I mention (.. pediinciilaUi from 

 Miavevatn on Stromo, but on further investigation I think thai the 

 specimens collected must be placed under C. hamulata, though all the 

 fruits have stalks, some even long stalks, as the sharpl}^ marked keel 

 peculiar to C. pcdnnciilata D. C. is wanting. Doubtless on the Færoes 

 C. pcdanciilata has not become difTerentiated from C. hamulata, as Hegel- 

 maier (Zur Systematik von Callitriche; Yerhandl. d. bot. Vereins f. 

 Brandenburg, IX, p. 33) points out as being the case in the British 

 Isles. This accounts for the frequent occurrence of the landform, though 

 C. hamulata is rarely a land plant, in contra-distinction to C. pcdnncii- 

 lata which is frequently found on damp ground. 



59. C. stagnalis Scop.; C. verna Landt, non L. 



Commonly grows together with the preceding, but is still more 

 frequent. as it occurs b}^ everj- water-pool and small stream in low-lying 

 regions. Rostrup mentions (1. c. p. 58) a var. pcdnnciilata as possibly 

 identical with C. pediincnlata D. C, but it is only a small landform 

 which is typical C. stagnalis, only some of the fruits are short stalked 

 (specimens in the collection of the Museum of the Botanical Gardens). 



No part of our rather large material consisted of C. verna L. 

 (C. vevnalis Koch) and I think Landt's statement is a confusion with 

 the above-named species. Also Sim mons's statement (1. c. p. 73) is 

 based on a wrong determination; this I have been able to prove as he 

 has kindly placed his specimens at my disposal, and they turned out 

 to be the aquatic form of C. hamulata. 



60. C. autumnalis L. 



Occurs only on Syd., in the lake at Vaags Ejde (R., !). 

 All the species have ripe fruit in August. 



Order XVIII. CARYOPHYLLACEAE. 



t Agpostemma Githago L. 



Str. : Skjelling »in agris« (Lyngbye 1817). No doubt accidentally 

 introduced in corn-fields in one single 3'ear; not scen afterwards. 



61. Alsine verna Bartl. var. hirta (Wormsk.) Lge. 



Syd.: Ornefjæld at some 400 m. (!). 



This small unpretending plant no doubt occurs in several piaces 

 on the hills, but we only met with a solitary specimen. 



