Abutilon costicalyx Schumann ex Takeuchi & Esteves, 2012

Takeuchi, Cátia & Esteves, Gerleni Lopes, 2012, Synopsis of Abutilon (Malvoideae, Malvaceae) in the state of São Paulo, Brazil, Phytotaxa 44 (1), pp. 39-57 : 53

Abutilon costicalyx Schumann ex Takeuchi & Esteves , sp. nov.

Affine A. amoeno laminis integris ad 3-sublobata et mericarpis sutura dorsali longe papillata, sed indumento velutino trichomatibus stellatis solum constato, calyce quam petala majore vel minore, externe nervis costatis semper praeditis et petalis invariabiliter luteis differt.

Type: BRAZIL. São Paulo: Apiaí , 6 June 2010, C. Takeuchi & T. Takeuchi 76 (holotype SP, isotype MAC). Fig. 4A–B .

Distribution and habitat:— Endemic to Brazil, A. costicalyx occurs from south of the state of São Paulo to Paraná. It grows in dense rainforest and in semideciduous forest, on forest margins, sometimes in disturbed habitats.

Specimens examined:— BRAZIL. São Paulo: Apiaí , 6 June 2010, C . Takeuchi & T . Takeuchi 75 ( SP). Bom Sucesso de Itararé , 19 August 1995, V. C . Souza et al. 8899 ( ESA, SP); São Lourenço da Serra , 29 May 1968, A . Krapovickas 14370 ( ESA, SP) . Paraná: Bocaiúva do Sul , 31 December 1969, G . Hatschbach 22768 ( MBM, SPF, SPSF); 4 December 1977, G . Hatschbach 40211 ( BHCB, MBM). Castro, 23 July 1998, L. R. M . Souza et al. s.n. ( UEC109174 ). Pedra Preta , 3 September 1939, M . Kuhlmann s.n. ( SP 41635 ). Rio Saltinho , 29 May 1968, A . Krapovickas 14369 ( CESJ, ESA, SP, SPF) .

Schumann (1891) cited A. costicalyx in Flora Brasiliensis for the specimen Glaziou 1583 (P).This name was later used by Baker (1893), but without presenting a Latin diagnosis. The characters observed in Glaziou 1583 especially the indumentum, and the morphology of the calyx and mericarps are similar to the characters present in the specimens from the state of São Paulo and Paraná annotated as Abutilon costicalyx Schumann ex Baker. In the present study we validate Schumann’s epithet.

Abutilon costicalyx is notable in its velvety indumentum, consisting only of stellate trichomes, calices with strongly ribbed nerves, invariably equal to or longer than the petals.

Conservation status:— According to the criteria found in Mamede et al. (2007) A. costicalyx should not be considered a threatened species, but it deserves attention as it fits into the category Near Threatened (NT).

Figures

FIGURE 4. A–B) A. costicalyx Schumann ex Takeuchi & Esteves A) Flower showing calyx; B) Mericarp, dorsolateral view, showing the dorsal long papillate suture. C-E) A. rufinerve Saint-Hilaire C) Branches with flowers; D) Calyx; E) Mericarp, dorsolateral view, showing the dorsal suture not papillate. F–G) A. nigricans Esteves & Krapovickas F) Calyx, showing the glabrous base; G) Mericarp, dorsolateral view. H–I) A. pedrae-brancae Schumann H) Leaf, with sub-trilobate blade; I) Mericarp, dorsolateral view. J–M) A. bedfordianum (Hooker) Saint Hilaire & Naudin; J) Branch with flower and fruit; K) Calyx; L) Staminal tube; M) Mericarp, dorsolateral view. N–P) A. venosum Lemaire N) Branch with fruit O) Calyx; P) Mericarp, dorsolateral view.