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4c7. Rosaceae Jussieu (subfam. Amygdaloideae) tribe Spiraeeae de Candolle in A. P de Candolle and A. L. P. P. de Candolle, Prodr. 2: 541. 1825.
[(as Spiraeaceae)]
Luc Brouillet
Shrubs, subshrubs, or herbs, perennial (Aruncus); unarmed. Leaves alternate, simple or pinnately compound; stipules absent; venation pinnate, sometimes palmate. Flowers: perianth and androecium perigynous; epicalyx bractlets absent or present; hypanthium shallowly bowl-shaped, hemispheric, campanulate, patelliform, +/- crateriform, or turbinate; torus absent, minute, or thickened; carpels 3–5(or 6)[–8], distinct, free or adnate to hypanthium base, styles +/- terminal, distinct; ovules 2–5, apical, collateral or clustered. Fruits aggregated follicles or achenes (Holodiscus); styles deciduous or persistent, not elongate.
Genera 8, species ca. 130 (6 genera, 25 species, including 3 hybrids, in the flora): North America, Mexico, Central America, South America, Eurasia; introduced widely.
The two genera not present in North America north of Mexico are the southeastern European-western Asian Sibiraea Maximowicz (five species) and the Mexican Xerospiraea J. Henrickson (one species). The base chromosome number for Spiraeeae is x = 9.
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1 |
Herbs, perennial; flowers unisexual; hypanthia shallowly bowl-shaped. |
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49 Aruncus, p. xx |
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Shrubs or subshrubs; flowers bisexual; hypanthia hemispheric, campanulate, patelliform, +/- crateriform, or turbinate |
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(2) |
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2 (1) |
Subshrubs; leaves 2–3(–5)-ternate, primarily crowded basally. |
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48 Luetkea, p. xx |
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Shrubs; leaves simple, cauline (tightly clustered in Petrophytum) |
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(3) |
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3 (2) |
Leaves deciduous, herbaceous, membranous, chartaceous, rarely coriaceous; stems erect, arching, or ascending, sometimes spreading to prostrate in Spiraea |
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(4) |
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Leaves persistent, often marcescent, coriaceous; stems prostrate (mat-forming), sometimes ascending or erect in Petrophytum |
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(5) |
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4 (3) |
Fruits aggregated follicles; inflorescences panicles or corymbiform or racemiform; carpels free; petals greenish, yellowish, white, pink, or purple. |
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44 Spiraea, p. xx |
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Fruits aggregated achenes; inflorescences panicles; carpels adnate to hypanthium base; petals usually white, sometimes pink tinged, rarely pink. |
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47 Holodiscus, p. xx |
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5 (3) |
Inflorescences panicles; petals white; stamens 20–40. |
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45 Petrophytum, p. xx |
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Inflorescences: flowers solitary; petals pink to pinkish, often purple tinged; stamens 7–12. |
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46 Kelseya, p. xx |
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Lower Taxa
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