Winged Nut
By LoveToKnow
Winged Nut (Pterocarya) - Walnut-like trees of fine stately form of leaf and habit, P. caucasica being hardy in England, at least in the southern and warmer parts.
tiny winged nutlets (nearly 1 million per pound)
Bark
young bark reddish-brown to black, with large horizontal lenticels; older bark black, plate-like ...
Fruits winged nutlets, 0.06" long, 0.03" wide.
Seed production begins at about age 15, with optimum production at 40 to 70 years. Trees produce good seed crops about every other year.
Fruit: Cone like, cylindrical, 1 inch long, deciduous at maturity releasing tiny, 2-winged nutlets; maturing in late summer and dispersed in early autumn.
Fruit: Tiny, 1-seeded, winged nutlet contained in the cone.
Ecological threat: Invasive exotics that are altering native plant communities by displacing native species, changing community structures or ecological functions, ...
Fruit is a three-winged nut (edible), enclosed by a prickly covering (involucre), 2 cm long. Fruit smaller and leaves have more veins (9-14 pairs vs. 5-9 pairs) than F. sylvatica.
Best in full sun, but will withstand part shade.
"Pterocarya" is Greek for "winged nut" and you can see both the nut and the wings developing in the picture below.
Cryptantha pterocarya (Cryptantha)
Boraginaceae (Forget-Me-Not Family) ...
FRUIT: A very small, winged nut. As in the other birches, nuts together with small scales, form a cone-like structure, (the strobile), about 1½" long.
Fruit is a winged nutlet, fall maturing. Prefers moist to wet soil , but adaptable to dry, it will seed itself if planted along stream banks. Nitrogen fixing species, does not require fertilization usually, not tolerant of heat.
Fruit
The female cones are oval-shaped, 2 centimetres long. The seed is a narrow winged nutlet.
The paper birch has both male and female flowers called catkins. These turn into little winged nutkins, which ripen in early August to mid September.
 See also: Green, Birch, May, Wintergreen, Paper birch
  
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