Difference between revisions of "Rosaceae tribe Spiraeeae"
in A. P de Candolle and A. L. P. P. de Candolle, in A. Pde Candolle and A. L. P. P. de Candolle, Prodr. 2: 541. 1825.
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|distribution=North America;Mexico;Central America;South America;Eurasia;introduced widely. | |distribution=North America;Mexico;Central America;South America;Eurasia;introduced widely. | ||
|discussion=<p>Genera 8, species ca. 130 (6 genera, 25 species, including 3 hybrids, in the flora).</p><!-- | |discussion=<p>Genera 8, species ca. 130 (6 genera, 25 species, including 3 hybrids, in the flora).</p><!-- | ||
| − | --><p>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).</p><!-- | + | --><p>The two genera not present in North America north of Mexico are the southeastern European-western Asian <i>Sibiraea</i> Maximowicz (five species) and the Mexican <i>Xerospiraea</i> J. Henrickson (one species).</p><!-- |
--><p>The base chromosome number for Spiraeeae is x = 9.</p> | --><p>The base chromosome number for Spiraeeae is x = 9.</p> | ||
|tables= | |tables= | ||
Revision as of 23:09, 21 November 2021
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.
Distribution
North America, Mexico, Central America, South America, Eurasia, introduced widely.
Discussion
Genera 8, species ca. 130 (6 genera, 25 species, including 3 hybrids, in the flora).
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.
Selected References
None.
Lower Taxa
Key
| 1 | Herbs, perennial; flowers unisexual; hypanthia shallowly bowl-shaped. | Aruncus |
| 1 | Shrubs or subshrubs; flowers bisexual; hypanthia hemispheric, campanulate, patelliform, +/- crateriform, or turbinate | > 2 |
| 2 | Subshrubs; leaves 2–3(–5)-ternate, primarily crowded basally. | Luetkea |
| 2 | Shrubs; leaves simple, cauline (tightly clustered in Petrophytum) | > 3 |
| 3 | Leaves deciduous, herbaceous, membranous, chartaceous, rarely coriaceous; stems erect, arching, or ascending, sometimes spreading to prostrate in Spiraea | > 4 |
| 3 | Leaves persistent, often marcescent, coriaceous; stems prostrate (mat-forming), sometimes ascending or erect in Petrophytum | > 5 |
| 4 | Fruits aggregated follicles; inflorescences panicles or corymbiform or racemiform; carpels free; petals greenish, yellowish, white, pink, or purple. | Spiraea |
| 4 | Fruits aggregated achenes; inflorescences panicles; carpels adnate to hypanthium base; petals usually white, sometimes pink tinged, rarely pink. | Holodiscus |
| 5 | Inflorescences panicles; petals white; stamens 20–40. | Petrophytum |
| 5 | Inflorescences: flowers solitary; petals pink to pinkish, often purple tinged; stamens 7–12. | Kelseya |