Senegalia, Rafinesque, 1838

Miller, Joseph T., Terra, Vanessa, Riggins, Chance, Ebinger, John E. & Seigler, David S., 2017, Molecular Phylogenetics of Parasenegalia and Pseudosenegalia (Fabaceae: Mimosoideae), Systematic Botany 42 (3), No. 465 - 469, pp. 464-469 : 468

KEY TO SENEGALIA TAXA

1. Prickles common on stem and usually the leaf petiole and rachis (prickles may rarely be absent or rare on individual specimens) .. .... Senegalia

1. Prickles absent onstem and leaf petioleand rachis.. ................................................................................ 2

2. Inflorescence a globose to subglobose head. .... ... ... .... ... ... ... .... ... ... .... ... .... ... ... ... .... ... ... .... ... ... .... ... ... 3

2. Inflorescenceacylindrical spike.............................................................................................. 4

3. Flowers pedicellate; stamens consistently 200+; petiolar glands absent .. .... ... ... ... .... ... .... ... ... .... ... ... ... ... …. Acaciella

3. Flowers sessileto rarely subsessile; stamens lessthan 200; petiolar gland present .............................. Parasenegalia (in part)

4. Leaflets small, 1.2 – 2.9 mmlongand 0.4 – 0.9 mm wide; petioles 0.5 – 13 mm long; spurbranches present.............................. 5

4. Leaflets mostly longer and wider; petioles most more than 15 mm long; spur branches absent... .... ... ... .... ... ... ... .... ... ..... 6

5. Perianth scarious; flowers 7.5 – 10.0 mm long, the corolla 3.3 – 6.0 mm long; Bolivia. ... ... .... ... ... .... ... ... ..... Pseudosenegalia

5. Perianth not scarious; flowers 5.5 – 7.5 mm long, the corolla 2 – 3 mm long; Mexico.. ... ... .... ... ... .... ... ... Mariosousa compacta

6. Fruit valves coriaceous; lenticels on twigs orange, orbicular to slightly elongated vertically, .............................. somemorethan 0.6 mmacross ............................................................... Parasenegalia (in part)

6. Fruit valves thinner, chartaceous; lenticels not orange, orbicular to slightly elongated horizontally, very ..... .......... ... rarelyto 0.6 mmacross ................................................................................ ... Mariosousa