i232 THE FLORA OF THE ALPS 
ceolate, stipules ovate-lanceolate, deciduous. S. Caprea, 
L., Sallow; leaves elliptic, tomentose beneath; a small 
tree. S. aurita, L.; leaves obovate-oblong, catkins short, 
dense-flowered. S. vzminalis, L., Osier; leaves linear- 
lanceolate, catkins sessile, branches very flexible. SS. 
purpurea, L.; leaves linear-lanceolate, catkins with purple- 
black scales. 
Division I].—MONOCOTYLEDONES or ENDOGENS. 
Stem, when perennial, with irregularly dispersed woody 
bundles, not in concentric circles, with no central pith 
or separable bark; leaves usually parallel-veined ; sepals, 
petals, and stamens usually in threes; embryo with one 
cotyledon. 
Crass; Vee PETALOLO A 
Calyx and corolla usually both present and coloured. 
(Orders LXXXIV.—XCIX.) 
Order LXXXIV.—HYDROCHARIDEZ:.. 
Aquatic herbs with floating or submerged opposite or 
whorled leaves; flowers usually unisexual and dicecious, 
buds enclosed in spathes; perianth 6-parted, coloured or 
inconspicuous ; stamens 3-12; ovary I-6-celled. A very 
small order, widely distributed; not alpine. 
I. HYDROCHARIS, L. 
Dicecious ; sepals 3, green; petals 3, white ; stamens 
12, some of them imperfect; ovary 6-celled; styles 6; 
leaves orbicular, entire. 
