240 GOTE TURESSON k 
order to answer the question collections of seed and small plants were 
made in the years 1916, 1917 and 1918 from various places along the 
Sound and the coast strip of Halland and Bohuslän. A great many 
of the plants raised were isolated with pergamin bags during these 
and the following years and a representative collection of different bio- 
types was obtained. It was thus found that the A. litorale popula- 
tions both of the Sound and of the Halland-Bohuslän coast were made 
TABLE 3. 
| Middle | Middle 
2 | length length BE Position Place and year 
Er | Fe Position of 2 } 
= ‚of mainiof basal à 1 of basal Leaf margin | Bractlets Flowering of coll. of the 
= Ce A main axis 
= jaxis (in branches branches mother plant- 
mm) |(in mm) 
| | 
171, 1005 | 1035 | Ascending | Ascending | Denticulate | Closed Late TheSound,1916 
172, 980 965 «| Erect » | Dentate » » » » 
175| 970 990 » Breet Almost entire | » » » » 
176, 945 970 » » » Spreading » » » 
169! 885 925 » » Entire Closed » » »' 
170, 860 870 » Ascending | Almost entire » » » » 
177, 810 | 840 » » » Spreading » » 1917 
178, 805 825 » Erect | Denticulate » Intermediat € » » 
168 635 115 » Ascending Dentate Closed five, Tate » » 
173) 580 595 | Ascending » » » Early Bohuslän, 1918 
174 540 600 » » » Spreading » » » 
155, 510 545 » » Entire Closed |Intermediate| Halland, 1917 
159, 425 | 430 Procumbent Procumbent, Almost entire Spreading Early A) » 
160 410 460 Prostrate | Prostrate | » » » » » 
156 405 480 |Procumbent » Dentate » Intermediate! Bohuslan, 1917. 
158} 375 | 415 » | » » » Late TheSound, 1916 
157} 330 | 405 Prostrate » » | » Intermediate » » | 
up of a large number of biotypes often differing noticeably from 
each other in various respects. It was also found that certain bio- 
types, representing certain combinations of characters, could be re- 
peatedly isolated from the population of the Sound but not from the 
Halland-Bohuslin coast. The additional fact was also brought to 
light that certain combinations very characteristic of the northern 
coast strip occurred but sparsely along the Sound. Table 3 gives 
the characteristics of 17 biotypes, most of them in culture since 1916 
—1917. The middle values of the length of the main axis and of 
basal branches have been based upon the measurements of the first 
