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Key to Morus

Moraceae

Morus

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1 Leaf blade 2-7 (-9) cm long; leaf undersurface scabrous or pubescent; petioles 0.3-0.6 (-1.5) cm long
1 Leaf blade (6-) 8-18 (-36) cm long; leaf undersurface glabrous or hairy (but not scabrous); petioles 2-5 cm long.
(c) Wang, Zihao - CC-BY
  2 Lobes elongate, 3-6× as long as wide, and with relatively parallel margins
(c) Hartley, Nate - CC-BY-NC, permission granted to NCBG
  2 Lobes elliptic, rounded, generally 1-2× as long as wide.
    3 Leaves with deeply cordate base, the sinus ca. 1.5-2 cm deep, the overall shape reniform-triangular to suborbicular, unlobed or rarely 3-lobed, usually with serrations ca. 2-3 mm deep; lower surfaces of mature sun-leaves softly pubescent; ripe fruits elliptic to short cylindric, mostly 1.0-1.5× as long as wide, with peduncle ca. 0.5 cm long, ripening Jun-Sep, usually with 20-40 drupelets; seeds usually 2.5-4 mm long; [uncertainly present in our region]
    3 Leaves with cuneate to truncate to shallowly cordate base, the sinus usually < 1.5 cm deep, the overall shape usually ovate, unlobed or often with 3-7 lobes, crenate or with serrations ca. 1-2 mm deep; lower surfaces of mature sun-leaves tomentose, pubescent, or largely glabrous (except on veins); ripe fruits short- or long-cylindric, mostly 1.5-4× as long as wide), with peduncles ca. 1-2 cm long, ripening May-Jul, usually with 30-70 drupelets; seeds usually 1.5-3 mm long; [collectively widespread and common].
(c) Kinser, Abel - CC-BY-NC, permission granted to NCBG
(c) Wong, Michelle - CC-BY
      4 Upper leaf surface glossy, glabrous or slightly scabrous; lower leaf surface glabrous, or slightly pubescent on the veins and in the vein axils only, the hairs 0.2-0.5 mm long; ripe fruits black, purple, red, pink, or white; fully-developed fruits mostly 1.5-2.5× as long as wide; pistillate inflorescences 5-8 mm long (in flower); petioles with shallow groove on upper side
(c) Bradley, Keith
(c) Bradley, Keith
      4 Upper leaf surface dull, scabrous; lower leaf surface pubescent on the veins, veinlets, and the surface between the veins, the hairs 0.4-0.7 mm long; ripe fruits black or purple; fully-developed fruits mostly 2-4× as long as wide; pistillate inflorescences 8-12 mm long (in flower); petioles terete or slightly flattened on upper side