Jacquemontia, Choisy

Pastore, Mayara, Moreira, André Luiz da Costa, Cavalcanti, Taciana Barbosa & Simão-Bianchini, Rosângela, 2017, A taxonomic study of Jacquemontia evolvuloides (Moric.) Meisn. and related species (Convolvulaceae), Adansonia 39 (2), pp. 149-166 : 151

IDENTIFICATION KEY FOR JACQUEMONTIA EVOLVULOIDES (MORIC.) MEISN. AND ALLIED SPECIES

1. Subshrubs with woody, mostly erect stems, sometimes scandent .................................................................. 2

— Herbs with herbaceous, voluble, scandent or prostrate stems ....................................................................... 4

2. Leaves and stem tomentose; bracteoles 5-8 mm long .................................................... J. fruticulosa Hallier f.

— Leaves and stem pubescent or hirsute; bracteoles 1.5-2.5 mm. long............................................................... 3

3. Plants ferruginous in sicco; stems densely branched near the base; peduncles 0.2-1.5 cm .......................... ....................................................................................................................... J. heterotricha O’Donell

— Plants greenish in sicco; stems sparsely branched throughout the plant; peduncles 3-6 cm ............................. ................................................................................................................................................... J. evolvuloides

4. Inflorescence dichasial congested (umbelliform to corymbiform) ( Fig. 1 ) .......... J. sphaerostigma (Cav.) Rusby

— Inflorescence monochasial or thyrsoid ( Fig. 1 ) .............................................................................................. 5

5. Leaves linear or narrowly lanceolate; sepals 3-4 mm long, glabrous ....................... J. linoides (Choisy) Meisn.

— Leaves ovate, elliptic or lanceolate; sepals 6.5-8 mm long, hirsute or pubescent ........................................... 6

6. Leaves brochidodromous, 5-6 pairs of secondary veins, stems greenish in sicco .......................... J. evolvuloides

— Leaves eucamptodromous, 2-3 pairs of secondary veins, stems reddish in sicco ............................................ 7

7. Glandular trichomes present; inflorescence thyrsoid or monochasial ............................ J. warmingii O’Donell

— Glandular trichomes absent; inflorescence monochasial ............................................................................... 8

8. Stems with a mix of stellate, 3-radiate and forked trichomes ( Fig. 2 ); bracteoles 8-12 mm long ...................... ........................................................................................................................................ J. guaranitica Hassl.

— Stems with a mix of simple trichomes thickened at the base and forked trichomes ( Fig. 2 ); bracteoles 3-4 mm long .............................................................................................................................. J. anomala O’Donell

Figures

FIG. 1. — Representative inflorescences: A, inflorescence dichasial congested in Jacquemontia sphaerostigma (M. Kuhlmann & A. Geht s.n. [SP39995]); B, in- florescence thyrsoid in Jacquemontia warmingii (S.M. Soares 565); C, inflorescence monochasial in Jacquemontia evolvuloides (G. Pereira-Silva 6283). Scale bars: A, B, C, 1 cm.

FIG. 2. — Representative trichomes: A, simple trichome thickened at the base; B, forked trichome with a very short ray; C, 3-radiate trichomes with unequal rays; D, glandular trichome; E, 3-radiate trichomes with equal rays. Scale bars: A, B, C, 0,5 mm; D, E, 0,25 mm.