Characteristic 13

Striae, short and long.

No striae, no glory!,

Graag in het vervolg altijd een foto van de gehele plant maken. Wanneer je slechts een onderdeel fotografeert, geef je beperkte informatie om de plant mee op naam te brengen. Probeer de plant beeldvullend te fotograferen en hierbij alle onderdelen in beeld te brengen. Maak eventueel aanvullend wat detailfoto's van blad, bloem en vruchten. Maar begin te allen tijde met een foto van de gehele plant

Some willows have short (up to 4 mm L) and/or long striae (from 5 mm L) under the (young) bark. Striae are ridges that lie on top. They are best observed on 3-year-old twigs. During the period from late April to August (sap flow), it is easiest to peel off a piece of bark (e.g. 10 cm) to check whether or not striae are present. If in doubt, allow the debarked piece of twig to dry for a few days and then re-examine.  (tip: or 10 seconds in the microwave)

13a Some short but most are long striae 2-30-(85) mm L; mature leaves matt-grey-green above, ash-grey below; flat or weakly wrinkled; leaf tip not pointed; short shoot 4.5-7 cm L, 1.5-2.6 cm W; long shoot up to 11.5 cm L, up to 4 cm W; usually at least 2x as long as wide; stipules prominent and persistent; leaf margin not or in most not wavy, sometimes wavy at end of long shoot; number of pairs of lateral veins lower surface of leaf: 8-18; twigs grey-green and softly hairy, late balding; buds hairy; widely spreading stout and not conspicuously branched shrub. 

► Salix cinerea ssp. cinerea 

13b Striae 5-30-(60) mm L; mature leaves top glossy dark green; flat or rarely wrinkled, leaf tip not pointed and rarely twisted; leaf underside bluish, not overly hairy but the hairs present are all rose-coloured; leaf shape elliptic ovate, inverted ovate; short shoot 4.5-7 cm L, 1.5-2.6 cm W; long shoot up to 11.5 cm L, up to 4 cm W; usually at least 2x as long as wide; stipules conspicuous and persistent; twigs weakly to strongly hairy and more reddish than S. cinerea ssp. cinerea. Can become tall tree.

► Salix cinerea ssp. oleifolia 

Rusty willow: considered by some authors to be a separate species, Salix atrocinerea.

Sometimes confusion can be caused by the presence of a reddish fungus on the underside of the leaves. This is difficult to see with a magnifying glass but clearer when using a bino (x 50).

The veins (not the hairs) may also colour underside of leaf a little red.

  see also:  http://172.104.19.75/notes/atrocinerea_cinerea/

13c Striae short and long but weak; (5)-7-10-12-(20) mm L; lanceolate leaves with greatest width above centre; long shoot to 14 cm L, 4 cm W; short shoot 7.2 cm L, 2.5 cm W; top edge matted and wrinkled; leaf colour above from greyish in spring to dark green and matt later in the season, long shoot below blue-grey woolly to adjacent strongly hairy with distinct veins; leaf edge long shoot crenate, short shoot quasi smooth; leaf tip pointed or pointed; twigs long shoot strongly hairy, short shoot little hairy to smooth; easily decomposing; vigorous grower with erect side branches; 2-8 m H. 

► Salix x calodendron 

Note: According to nomenclature, S. x calodendron is a female plant, but several such triple male bastards have been observed in Flanders.

13d Numerous striae 2-15 (-20) mm; leaves short shoot inversely ovate to elliptic and small, 1.2-2.0-(3.5) cm L, 7-25-(35) mm W; leaves long shoot may be longer and broader, up to 6.5 cm L, 3.5 cm W; underside of leaf greyish hairy-looking, long shoot much more glabrous; leaf short shoot usually wrinkled; leaf margin wavy with a somewhat gutter-shaped curved leaf tip; stipules ear-shaped prominent and persistent; number of pairs of lateral veins underside leaf: 6-10; thin twigs and conspicuously branched at tips, more reddish coloured; up to 2.5 m H. 

► Salix aurita 

 Flowers quite late and very gradually, long flowering period.

13e Striae not numerous, usually 5-15 mm L and weak; leaves of short shoot inverted ovate, intermediate in shape between S. aurita and S. caprea (and often present with all shades); 1.5-7 cm L, 8-45 mm W, leaf of long shoot can be up to 8 cm long and 5 cm wide; underside of leaf initially strongly hairy, later bluish and less hairy-looking but still soft-hairy to the touch (perceptible with magnifying glass as hairy); leaf margin somewhat wavy and top often twisted but less pronounced than in S. aurita. Veins on top of leaf somewhat 'sunken' so that leaf looks somewhat wrinkled; stipules conspicuous and persistent. Twigs often somewhat reddish.

 ► Salix x capreola (S. aurita x S. caprea) 

13f Striae frequent but less than in S. cinerea ssp. cinerea, 5-35 mm L; relatively dark leaves upper surface, whitish-grey hairy and soft to the touch below; top blunt or short pointed, often twisted; leaves flat or weakly wrinkled; at least 2x as long as wide; short shoot 3-5 cm L; stipules conspicuous and persistent; leaf margin often wavy-serrated; underside usually with distinct veins; short petiole 3-6 mm L; twigs weakly to strongly hairy; buds glabrous; stout twigs not conspicuously branched. 

► Salix x multinervis (S. aurita x S. cinerea ssp. cinerea)