|
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
| Related Links (opens in a new window) |
|
Other Databases
|
|
|
|
|
|
|
