Family: Willow [Salicaceae]


Populus

Salix

Salix covers Willows, Sallows and Osiers, from tall trees to prostrate undershrubs. They are all deciduous, most have alternate leaves, and nearly all grow in damp places. Osiers are tall shrubs, usually growing by fresh water. Sallows are tall shrubs or low trees with broad leaves. Willows are trees, sometimes very small trees in the case of Dwarf Willow; many hybridise with one another. They all bear flowers in catkins

Populus covers Aspen, a tree, and the Poplar trees which are tall.



[SALIX] Willows

 

WILLOW HYBRID CHART (shrunk)
Hybrid Chart: WILLOW (larger)

There are also 13 triple hybrids, namely:
Salix aurita × cinerea × phylicifolia
Salix caprea × myrsinifolia × phylicifolia (Salix × phylicioides nom. nud.)
Salix cinerea × myrsinifolia × phylicifolia
Salix herbacea × myrsinifolia × phylicifolia
Salix myrsinifolia × phylicifolia × repens
Salix viminalis × cinerea × repens (Salix × angusensis)
Salix myrsinifolia × phylicifolia × myrsinites (Salix × blyttiana)
Salix caprea × cinerea × viminalis (Salix × calodendron)
Salix cinerea × aurita × myrsinifolia (Salix × forbesiana)
Salix cinerea × purpurea × viminalis
Salix aurita × myrsinifolia × phylicifolia (Salix × saxetana)
Salix purpurea × aurita × phylicifolia (Salix × sesquitertia)
Salix aurita × caprea × viminalis
with four of them being hybrids of Dark-leaved Willow (Salix myrsinifolia) and Tea-leaved Willow (Salix phylicifolia) with another Willow. These hybrids are not shown properly on the hybrid chart above, being partially over-lapped by normal hybrids with just two parents.

There is also a one quadruple hybrid:
Salix × taylorii (Salix purpurea × viminalis × caprea × cinerea)

Salix SPECIES LACKING HYBRIDS
(Salix acutifolia) Siberian Violet-willow
(Salix caprea subsp. caprea) Goat Willow
(Salix caprea subsp. sphacelata) Goat Willow
(Salix cinerea subsp. cinerea) Grey Willow
(Salix cinerea subsp. oleifolia) Grey Willow
(Salix daphnoides) European Violet-willow
(Salix elaeagnos) Olive Willow
(Salix eriocephala) Heart-leaved Willow
(Salix fragilis var. decipiens) White Welsh Willow
(Salix fragilis var. fragilis) Crack Willow
(Salix fragilis var. furcata) A Crack Willow
(Salix fragilis var. russelliana) Bedford Willow
(Salix irrorata)
(Salix matsudana)
(Salix reticulata) Net-leaved Willow
(Salix udensis) Sachalin Willow

Dwarf Willow (Salix herbacea) Photo: © Derek Mayes



[POPULUS] Poplar

 

[Populus]
POPLAR HYBRID CHART
[Populus]
POPLAR
HYBRIDS
BSBI MAPS
White
Poplar

(alba)
Eastern
Balsam-poplar

(balsamifera)
Black-poplar
(nigra)
Aspen
(tremula)
Western
Balsam-poplar

(trichocarpa)
Western
Balsam-poplar

(trichocarpa)
  Hybrid
Balsam-poplar
   
Aspen
(tremula)
Grey
Poplar
     
Black-poplar
(nigra)
  nigra
×
balsamifera
x
deltoides
   
Eastern
Balsam-poplar

(balsamifera)
  nigra
×
balsamifera
x
deltoides
  Hybrid
Balsam-poplar
White
Poplar

(alba)
    Grey
Poplar
 

There exists a triple hybrid amidst these on the hybrid chart, Populus × jackii (Populus nigra × balsamifera × deltoides) where one of its parents, Eastern Cottonwood (Pupulus deltoides) is native to North America and does not grow wild in the UK, so does not appear on the chart nor in the BSBI database. Must he triple hybrid therefore be capable of reproducing itself, seeing as it is represented in the UK?

Populus SPECIES LACKING HYBRIDS
(Populus maximowiczii) Japanese Balsam-poplar
(Populus nigra 'Italica') Lombardy-poplar
(Populus nigra subsp. betulifolia) Black-poplar
(Populus trichocarpa 'Columbia River')
(Populus trichocarpa 'Trichobel')

Family: Willow [Salicaceae]

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