CERASTIUM 
47 
Shoot less woolly than C. alpinum. Laminae ovate, more acute, greener, the pubescence shorter. 
Upper bracts with a distinct scarious margin. Pollen defective. Capsule short. Seeds usually abortive. 
With the assumed parents on the higher Scottish mountains, as in Perthshire (Ben Lawers and Ben Heasgarnich). 
Sweden. 
C. alpinum x VtllgCLtlAWl Samzelius in Bot. Notiser 177 (1890); x C. laestadianum Samzelius toe. cit . ; 
C. alpinum var. pubescens Syme Eng. Bot. ii, 85 (1864) partim. 
leones : — Camb. Brit. Ft. iii. Plate 45. (a) Fertile shoot, (b) Petals. ( c ) Ovary. ( d ) Seeds (enlarged) 
Banffshire (E. S. M.). 
Exsiccata : — Herb. Druce, 2648, 5875, 6514. 
Shoot erect or ascending, loosely caespitose. Laminae narrower than in C. alpinum , obovate to 
obovate-lanceolate, less hairy than C. alpinum var. lanatum, the hairs shorter and nearly eglandular. 
Inflorescence with 3 — 6 flowers. Sepals usually narrower than in C. alpinum. Petals about twice as 
long as the sepals. 
High Scottish mountains, as in Perthshire (Ben Lawers), Argyllshire (Ben Laiogh), Inverness-shire, and 
Banffshire. 
Sweden. 
3. CERASTIUM ARCTICUM. Arctic Chickweed. Plate 46 
Alsines myosotis facie lychnis alpina flore amplo niveo Lhwyd in Ray Syn. 147 (1690) ; ed. 3, t. 15, fig. 2, 349(1724). 
Cerastilim arcticum Lange Ft. Dan. 1 , 7, t. 2963 (1880) tab. emend.; in Overs. Vid. Selsk. Forha7id. 
1 19 (1880); C. alpinum Hudson Ft. Angl. 176 (1762) excl. syn. Bauhin, 
non L. ; C. latifolium Smith Eng. Bot. no. 473 (1798); Ft. Brit. 501 
(1800)!; excl. syn. Raii ; Babington Man. 53 (1843); Syme Eng. Bot. 
ii, 86 (1864); non L. ; C. alpinum var. smithi Hooker Stud. FI. ed. 3, 
60 (1884) incl. var. edmondstoni ; C. edmondstoni Murbeck et Ostenfeld in 
Bot. Not. 246 (1896). 
leones : — Smith Eng. Bot. t. 473, as C. latifolium ; FI. Dan. t. 2963 
(excl. seeds). 
Camb. Brit. FI. iii. Plate 46. (a — e) Fertile shoots, (f) Portion 
of stem (enlarged). (g) Leaf (enlarged). (h) Sepals (enlarged). 
(z) Petal (enlarged). (J) Fruit (enlarged). ( k ) Seeds (enlarged). 
Ben More, Assynt, Sutherlandshire (E. S. M.). 
Exsiccata : — Don, 61, as C. alpinum ; Fries, ix, 38, as C. lati- 
folium ; herb. Druce, 316, 672, 690, 2355, 2372. 
Perennial. Shoot usually laxer than in C. alpinum , hairy 
though less so than in the British form of C. alpinum. Leaves 
elliptical, about 1 cm. long and 4 mm. broad. Bracts rather 
smaller than the leaves, herbaceous. Inflorescence solitary. 
Flowers less campanulate and more open than in C. alpinum , 
up to about 2 cm. in diameter ; May to August. Sepals narrowly 
ovate, acute, with a scarious margin. Petals about twice as long 
as the sepals. Capsule about 1*5 times as long as the calyx, 
about 10 — 12 mm. long and 3 — 4 broad. Seeds reddish-brown, 
rugose and prominently so at the margin, nearly 3 mm. in 
diameter ; larger than in C. alpinum ; testa rather loose. 
Bentham {Cat. PI. Pyr. 69 (1826)) pointed out that the plant then known 
in this country as “ C. latifolium Linn.” was not the Linnaean plant. N. E. Brown 
{Eng. Bot.^ed. 3, suppl., pp. 41 and 42 (1891)) regarded the British plant as 
“really C. latifolium , but a form with smaller seeds.” My own view is that our 
plant is a species which forms a passage from C. alpinum to C. latifolium. 
Plants from Snowdon, in Carnarvonshire, were identified by Professor Lange 
as his C. arcticum {fourn. Bot. xxv, 374 (1887)). 
Mr F. N. Williams (in fourn. Bot. xxxvi, 386 (1898)) expresses the view 
that C. arcticum is a hybrid between two forms of C. alpinum. Not only, 
however, are the seed-characters against this view; but C. arcticum occurs in 
Zetland, as well as on some Scottish hills, where C. alpinum is unknown. 
Map 20. Distribution of C. arcticum in 
Great Britain 
