REVISION OF I IE BRITISI SPECIES OF SAGINA - BSBI Archive

WILLIAMS) SAGINA. 199
don (R. W. Scully, Flora, 1916, p. 46); to 5~ metres in Galway
(Cyb. Hib. ed. 2, p. 59); and to 375 metres in W. Yorkshire, on
the shingly sandy margin of the south side of Malham Tarn (F. A.
Lees, Flora, p. 169),-though the plant is very rare in Yorkshire.
, The mode of growth in this and the other perepnial species of
Sagina is, first, the production of a rosette, from the lower leaves
of which axillary stems are produced. These Jateral stems in S.
procumben,s and Linnmi take root early, but in S. subulata and
nodosa, not until a much later period. The lateral stems alone
produce flowers which are in a terminal cyme. Be~ides this, they
produce, later in the season, a bud towards the base of the flowering
stem, which grows into the central barre~ rosette of the succeeding
year. The rosette of the parent at last withers, and the
lateral stems become separate plants, united together until set free
by the decay of the connecting portion, which is superficial in
S. procumbens and Lin~i, but shorter and generally buried in
.
S.
Syn.-S.
subulata
procumbens
and nodosa.'
var.
(Syme,
b Linn.,
Engl.
Sp.
Bot.
Plant.
ii. p.
p.
123).
185; SPergula
laricina Lightfoot, Fl. Scotica, i. p. 244 (1777), non Linn. (1753),
i.e. Alsine laricina Crantz, nec Wulfen (1788), i.e. SPergula arvensis
Linn.; Spergula subulata Swartz in VeL Acad. Handling.
Stockholm, 1789, p. 45, t. I, fig. 3; Phaloe subulata Dumort., Fl.
Belgica, p. 110 (1827); Alsine subulata Jessen, Deutsch. Excurs.
fl. p. 286 (1879).
s. SCOT1CA G. C. Druce in Bot. Exch. Club Rep. 1911
vol. 3, p. 14, April, 1912).
A priore distinguenda: Rhizoma cras~ius. Caudiculus repens et
radicans, adscendens. Folia brevius aristata. Pedunculi prrelongi,
glabri. Sepala elliptica. Petala conspicua, calycem subrequantia.
Syn.-S.
glabra var. ,scotica G. C. Druce in New Phytologist,
194, p. 310.
On the Phyto-geographical excursion this plant was noticed on
the lower slopes of Ben Lawers, Perthshire, by the large burn
which descends from the Gentian rocks. It suggested a creeping
form of S. subulata. The plants were in good quantity and in free
flower 17 Aug., 1911; and they occurred at levels from 360 to