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The Collaborative International Dictionary
Salix caprea

Sallow \Sal"low\ (s[a^]l"l[-o]), n. [OE. salwe, AS. sealh; akin to OHG. salaha, G. salweide, Icel. selja, L. salix, Ir. sail, saileach, Gael. seileach, W. helyg, Gr. "eli`kh.]

  1. The willow; willow twigs. [Poetic]
    --Tennyson.

    And bend the pliant sallow to a shield.
    --Fawkes.

    The sallow knows the basketmaker's thumb.
    --Emerson.

  2. (Bot.) A name given to certain species of willow, especially those which do not have flexible shoots, as Salix caprea, S. cinerea, etc.

    Sallow thorn (Bot.), a European thorny shrub ( Hippophae rhamnoides) much like an El[ae]agnus. The yellow berries are sometimes used for making jelly, and the plant affords a yellow dye.

Wikipedia
Salix caprea

Salix caprea (goat willow, also known as the pussy willow or great sallow) is a common species of willow native to Europe and western and central Asia.

It is a deciduous shrub or small tree, reaching a height of , rarely to 13 m. The leaves are 3–12 cm long and from 2–8 cm wide, broader than most other willows. The flowers are soft silky, and silvery 3-7-cm-long catkins are produced in early spring before the new leaves appear; the male and female catkins are on different plants ( dioecious). The male catkins mature yellow at pollen release, the female catkins mature pale green. The fruit is a small capsule 5–10 mm long containing numerous minute seeds embedded in fine, cottony hairs. The seeds are very small (about 0.2 mm) with the fine hairs aiding dispersal; they require bare soil to germinate.

The two varieties are:

  • S. c. var. caprea - lowland regions throughout the range, leaves thinly hairy above, densely hairy below, 5–12 cm long, stipules persistent until autumn
  • S. c. var. sphacelata (Sm.) Wahlenb. (syn. S. caprea var. coaetanea Hartm.; S. coaetanea (Hartm.) Floderus) - high altitudes in the mountains of central and northern Europe (Alps, Carpathians, Scotland, Scandinavia), leaves densely silky-hairy on both sides, 3–7 cm long, stipules early deciduous

The scientific name, and the common name goat willow, probably derive from the first known illustration of the species in Hieronymus Bock's 1546 Herbal, where the plant is shown being browsed by a goat. The species was historically also widely used as a browse for goats, to which Bock's illustration may refer.