Almeida, Almeida & Amorim & Corrêa & Berg, 2017

Almeida, Rafael Felipe De, Amorim, André Márcio, Corrêa, Angela Maria Da Silva & Berg, Cássio Van Den, 2017, A new infrageneric classification for Amorimia (Malpighiaceae) based on morphological, phytochemical and molecular evidence, Phytotaxa 313 (3), pp. 231-248 : 244

2. Amorimia subg. Uncinae R.F. Almeida , subg. nov. ( Figs. 9 , 11 ).

Type:— Amorimia pubiflora ( Jussieu 1833: 14) Anderson (2006: 183) .

This subgenus differs from Amorimia subgenus Amorimia by its adaxially glabrous sepals; sepal glands green turning yellow to dark green; petals obovate to spatulate with a cuneate base, adaxially glabrous (occasionally distally hairy in A. septentrionalis ), straight claws; anthers usually glabrous (occasionally hairy in A. pubiflora and A. septentrionalis ); styles with apex uncinated to occasionally apiculate; and spherical pollen grains.

Notes:— This subgenus includes seven species mostly restricted to seasonally dry tropical forests of northwestern and eastern South America: A. amazonica , A. camporum , A. concinna , A. kariniana , A. pubiflora , A. septentrionalis Anderson (2006: 185) and A. tumida ( Fig. 11 ).

Figures

FIGURE 9. Synapomorphies of Amorimia (clade A): bracts glandular, petals pubescent on both sides, samaras with the two lateral wings larger than the dorsal wing and presence of monofluoracetate. Synapomorphies of Amorimia subg. Uncinae (clade B): sepals acute at apex and glabrous abaxially, elaiophores green turning yellow, petals yellow never turning orange or red with age and cuneate at base, styles uncinate at apex and pollen grains spherical. Synapomorphies of Amorimia subg. Amorimia (clade C): sepals rounded at apex and pubescent abaxially, elaiophores yellow turning red to ochre, petals yellow turning orange to red with age and truncate at base, styles truncate at apex and pollen grains polygonal. Synapomorphies of Mascagnia: elaiophores pink turning ochre with age, petals keeled and samaras with lateral wings larger than dorsal wing, and fused into an orbicular wing. Synapomorphies of Ectopopterys: sepals eglandular, deflexed, anther with enlarged connectives, apex of foliate styles and samaras with the dorsal wing larger than the lateral wings thickened on the lower side.

FIGURE 11. Distribution map of species from Amorimia subg. Uncinae R.F.Almeida: ●—A. septentrionalis; ○—A. amazonica; ▲—A. pubiflora; Δ—A. tumida; ■—A. kariniana; □—A. camporum; *—A. concinna. South American phytogeographical domains: Amazon rainforest—light green, Chaco/Pantanal—yellow, cerrado—orange, caatinga—white, Atlantic Forest—dark green, and Pampas—blue.