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FNA | Family List | FNA Vol. 9 | Amaryllidaceae | Rosaceae subfam. Amygdaloideae

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.


1 Herbs, perennial; flowers unisexual; hypanthia shallowly bowl-shaped.   49 Aruncus, p. xx
+ Shrubs or subshrubs; flowers bisexual; hypanthia hemispheric, campanulate, patelliform, +/- crateriform, or turbinate   (2)
       
2 (1) Subshrubs; leaves 2–3(–5)-ternate, primarily crowded basally.   48 Luetkea, p. xx
+ Shrubs; leaves simple, cauline (tightly clustered in Petrophytum)   (3)
       
3 (2) Leaves deciduous, herbaceous, membranous, chartaceous, rarely coriaceous; stems erect, arching, or ascending, sometimes spreading to prostrate in Spiraea   (4)
+ Leaves persistent, often marcescent, coriaceous; stems prostrate (mat-forming), sometimes ascending or erect in Petrophytum   (5)
       
4 (3) Fruits aggregated follicles; inflorescences panicles or corymbiform or racemiform; carpels free; petals greenish, yellowish, white, pink, or purple.   44 Spiraea, p. xx
+ Fruits aggregated achenes; inflorescences panicles; carpels adnate to hypanthium base; petals usually white, sometimes pink tinged, rarely pink.   47 Holodiscus, p. xx
       
5 (3) Inflorescences panicles; petals white; stamens 20–40.   45 Petrophytum, p. xx
+ Inflorescences: flowers solitary; petals pink to pinkish, often purple tinged; stamens 7–12.   46 Kelseya, p. xx

Lower Taxa


 

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