Sida sect. Nelavagae, Borssum-Waalkes, 1966

Baracho, George Sidney & Agra, Maria De Fátima, 2016, A new record of Sida glutinosa (Malvaceae), a rare species of the Caatinga in northeastern Brazil, with lectotypifications and taxonomic notes on the allied Sida glabra, Phytotaxa 282 (1), pp. 37-45 : 42-43

Key to species of Sida sect. Nelavagae in the States of Paraíba and Pernambuco

1. Flowers and fruits crowded in subsessile axillary glomerules often aggregated into terminal interrupted spikes .............................. ............................................................................................................................................... Sida urens L. (subsect. Conglomerata )

- Flowers and fruits solitary in the axils, or in diffuse panicles.........................................................................2 (subsect. Nelavagae )

2. Plants decumbent or repent, never viscid; leaves asymmetric; calyx accrescent............................................... Sida jussiaeana DC.

- Plants erect, or sometimes, scandent, densely viscid; leaves symetric; calyx not accrescent............................................................3

3. Sepals obtrullate, the lobes 0.8–2 mm long; petals symmetric; staminal column with minutely glandular and stellate hairs; mericarps apically 2–spined....................................................................................................................... Sida glutinosa Comm. ex Cav.

- Sepals trullate or rhombic, the lobes 3–5 mm long; petals asymmetric; staminal column glabrous or with few simple hairs; mericarps rounded, muticous.....................................................................................................................................................................4

4. Upper leaf surface with minute simple hairs; calyx lobes with stellate hairs, and often with sparse simple hairs in addition; mericarps with dorsal wall rugose ............................................................................................................................. Sida abutifolia Mill.

- Upper leaf surface with minute glandular hairs; calyx lobes with glandular hairs, the margins and tips with simple hairs; mericarps with dorsal wall smooth............................................................................................................................ Sida luschnathiana Steud.