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ROSACEAE Subfam. PRUNOIDEAE
李亚科 li ya ke
Trees or shrubs. Stipules present. Leaves simple; leaf blade margin serrate or rarely entire. Ovary superior; carpels 1(–5), with 2 pendulous anatropous ovules per carpel. Fruit a drupe; mesocarp succulent, fleshy, or dry, not splitting or more rarely splitting when ripe.
Ten genera and ca. 400 species: Africa, America, Asia, NE Australia, Europe, Pacific Islands; nine genera and 115 species (69 endemic, nine introduced) in China.
The genera Amygdalus, Armeniaca, Cerasus, Laurocerasus, Padus, and Prunus are often treated at the subgeneric or sectional level within the genus Prunus. Pygeum is usually treated as a distinct genus but has sometimes also been included within Prunus. The three cherry genera (Cerasus, Laurocerasus, and Padus) are probably more closely related to each other than they are to the other genera in the Prunoideae. Recent phylogenetic studies based on molecular data show that none of these three cherry genera are monophyletic, and their separation is probably not justified (Bortiri et al., Syst. Bot. 26: 797–807. 2001).
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| 1 |
Style lateral; branches with regularly produced axillary spines with a few or no leaves; petals white, cream, or yellow. |
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47 Prinsepia |
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Style terminal; branches unarmed or with leafy spine-tipped branchlets; petals white, pink, light red, or purple (yellowish white in Laurocerasus undulata). |
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(2) |
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| 2 (1) |
Sepals and petals minute and ± indistinguishable. |
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(3) |
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Sepals and petals large and clearly differentiated. |
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(4) |
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| 3 (2) |
Plants evergreen; leaf blade margin entire or minutely serrulate. |
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54 Pygeum |
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Plants deciduous; leaf blade margin with simple, double, or incised gland-tipped teeth. |
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55 Maddenia |
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| 4 (2) |
Drupe grooved, hairy or glabrous but if glabrous usually glaucous; endocarp distinctly compressed. |
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(5) |
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Drupe not grooved, glabrous but not glaucous; endocarp not or hardly compressed. |
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(7) |
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| 5 (4) |
Axillary winter buds 3 with 2 lateral flower buds and 1 central leaf bud; terminal winter bud present; leaves conduplicate when young; endocarp often pitted, rarely smooth. |
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48 Amygdalus |
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Axillary winter buds single; terminal winter buds absent; leaves convolute [or conduplicate] when young; endocarp usually smooth or inconspicuously pitted. |
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(6) |
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| 6 (5) |
Flowers sessile or shortly pedicellate; ovary and fruit usually pubescent. |
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49 Armeniaca |
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Flowers distinctly pedicellate; ovary and fruit glabrous, often glaucous. |
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50 Prunus |
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| 7 (4) |
Inflorescences usually with conspicuous bracts; flowers solitary to several in short racemes or corymbs. |
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51 Cerasus |
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Inflorescences with small bracts; flowers 10 or more in racemes. |
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(8) |
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| 8 (7) |
Plants deciduous; rachis base usually with leaves, rarely leafless. |
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52 Padus |
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Plants evergreen; rachis base leafless. |
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53 Laurocerasus |
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Lower Taxa
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