Acer sect. Rubra Pax, Bot. Jahrb. Syst. 6: 326. 1885.

Harris, AJ, Chen, Yousheng, Olsen, Richard T., Lutz, Sue & Wen, Jun, 2017, On merging Acer sections Rubra and Hyptiocarpa: Molecular and morphological evidence, PhytoKeys 86, pp. 9-42: 26-27

publication ID

http://dx.doi.org/10.3897/phytokeys.86.13532

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scientific name

Acer sect. Rubra Pax, Bot. Jahrb. Syst. 6: 326. 1885.
status

 

Acer sect. Rubra Pax, Bot. Jahrb. Syst. 6: 326. 1885. 

Acer sect. Hyptiocarpa  W.P. Fang, Acta Phytotax. Sin. 11: 172. 1966.

Acer sect. Laurina  Ogata, Bull. Tokyo Univ. Forests 63: 151. 1967.#

Type species.

Acer rubrum  Linnaeus.

Description.

Trees, deciduous or evergreen, with labile sex expression ranging from monoecy to dioecy (possibly exclusively dioecious in A. pycnanthum  ). Wood distinctly ring-porous, rays 1-4(10) cells wide. Bud scales imbricate, decussate, in pairs of 4-11. Leaves entire, unlobed, or 3- or 5- lobed, elliptic to ovate, toothed or entire, glaucous to blue-colored beneath; cuticular waxes of leaves comprising a smooth layer on the adaxial surface and bearing membranous platelets and wax splatter features abaxially; primary veins 1 or 3, 5 in 5-lobed individuals of A. saccharinum  ; petioles sometimes turning red (e.g., new growth, late season). Inflorescences axillary (rarely terminal) from leafless buds, usually emerging before leaves, paniculate thyrses, racemes, or umbels. Sepals 5. Petals 0 or 5, red, red-green, or green when present. Stamens 5-12, inserted on ( A. laurinum  and A. pinnatinervium  ) or outside of staminal disk, disk sometimes reduced or absent ( A. rubrum  , A. saccharinum  , A. pycnanthum  ). Carpels 2. Fruits schizocarps with partially inflated seed locules, sometimes turning red during maturation, partitioning wall generally narrower than the seed locules; mericarps diverging from each other at less than 90°, wings straight to slightly convex on the proximal (vein-dense) side, curved on the distal side. Some fruits seedless and partially developed at maturity.

Five species showing a disjunct distribution between eastern and southeastern Asia (3 spp.) and eastern North America (2 spp.), a common biogeographic pattern among Northern Hemisphere plant groups ( Donoghue and Smith 2004; Harris et al. 2013, 2017; Li 1952; Wen 1999, 2001; Xiang et al. 2015).

Acer laurinum  Hasskarl, Tijdschr. Natuurl. Gesch. Physiol. 10: 138. 1843.

Acer javanicum  Junghuhn, 1841

Acer niveum  Blume, 1847

Acer cassiifolium  Blume, 1847 (as cassiaefolium)

Acer philippinum  Merrill, 1906

Acer garrettii  Craib, 1920

Acer decandrum  Merrill, 1932

Acer chionophyllum  Merrill, 1941

Acer longicarpum  Hu & W. C. Cheng, 1948

Acer macropterum  T. Z. Hsu & H. Sun, 1997

Acer pinnatinervium  Merrill, Brittonia 4: 109. 1941.

Acer machilifolium  Hu & Cheng, 1948

Acer jingdongense  T. Z. Hsu, 1983

Acer pycnanthum  K. Koch, Ann. Mus. Bot. Lugduno-Batavi 1: 250. 1864.

Acer rubrum  Linnaeus, Sp. Pl. 1055. 1753.

Acer carolinianum  Walter, 1788

Acer barbatum  Michaux, 1803, pro parte

Acer sanguineum  Spach, 1834

Saccharodendron barbatum  (Michaux) Nieuwland, 1914, pro parte

Rufacer carolinianum  (Walter) Small, 1933

Rufacer rubrum  (Linneaus) Small, 1933

Acer saccharinum  Linnaeus, Sp. Pl. 1055. 1753.

Acer sylvestre  Young, 1783

Acer glaucum  Marshall, 1785

Acer rubrum Linneaus var. pallidum  Aiton

Acer dasycarpum  Ehrhart, 1789

Acer eriocarpum  Michaux, 1803

Acer tomentosum  Steudel, 1821

Acer coccineum  F. Michaux

Saccharosphendamnus saccharina  (Linnaeus) Nieuwland, 1914

Argentacer saccharinum  (Linnaeus) Small, 1933