Hornschuchia obliqua Maas & Setten
- Dataset
- Hornschuchia (Annonaceae), an endemic and threatened genus from the Brazilian Atlantic Forest
- Rank
- SPECIES
Classification
- kingdom
- Plantae
- phylum
- Tracheophyta
- class
- Magnoliopsida
- order
- Magnoliales
- family
- Annonaceae
- genus
- Hornschuchia
- species
- Hornschuchia obliqua
biology_ecology
Phenology Flowering from February to October, fruiting from July to November.
conservation
Conservation status Endangered, EN B 1 ab (i, ii, iii) + 2 ab (i, ii, iii) (Amorim et al. 2020 b). Hornschuchia obliqua is only known from three localities. It has not been collected in 19 years.
description
Description Shrubs or trees, 1.5 – 8 m tall. Leaves chartaceous, petiole 1 – 3 mm long, lamina 12 – 31.5 × 3.6 – 10.3 cm, oblanceolate to narrowly oblong or narrowly elliptic, both surfaces glabrous, base asymmetric or cuneate, apex acuminate, acute, attenuate, primary vein impressed adaxially and raised abaxially, 9 – 18 pairs of secondary veins, angles between primary and secondary veins 30 – 45 °. Inflorescence 3 – 8 - flowered, in shortened, highly ramified branches, terminal or supra-axillary, bracts rarely persistent, 1.0 – 1.3 × 0.4 – 0.5 cm. Flowers with pedicel 3 – 30 mm long, flower buds 3 – 6 × 1 – 2 mm, cylindrical with obtuse apex, covered in trichomes. Sepals completely connate, calyx cupuliform, apex truncate, 2 – 4 × 1 – 4 mm, glabrescent. Petals linear, white, 7 – 7.5 mm long, glabrous, stamens 6, 2.5 – 3 × 0.5 mm, carpels 3, 2.4 – 3 × 0.5 mm. Monocarps 1 – 2, fusiform, 15 – 45 × 5 – 8 mm, densely covered in trichomes, immature monocarps whitish in vivo, sessile. Seeds 1 – 2.
description
Figs 4 D, 5
discussion
Notes Hornschuchia obliqua and H. santosii have 3 – 12 - flowered inflorescences, which are axillary, terminal (Fig. 4 D) or leaf-opposed. However, H. obliqua differs from H. santosii by its cylindrical floral bud (vs conical), fusiform monocarp, 1.3 – 6 mm wide, densely covered in trichomes and whitish in vivo (vs globose, 16 – 19 mm wide, glabrous, green in vivo; Fig. 4 E). The description of H. myrtillus has been updated (Johnson & Murray 1995) with information regard the plant size and fruit dimensions.
distribution
Distribution and habitat Hornschuchia obliqua is endemic to Bahia, where it occurs in lowland tropical moist forest (Gouvêa et al. 1976; Thomas & Barbosa 2008; Fig. 5).
materials_examined
Type: BRAZIL – Bahia • “ Cairu, Estrada Cairu-Ituberá, 8 km S de Cairu ”; [13 ° 34 ′ 22.4 ″ S, 39 ° 03 ′ 22.6 ″ W]; 26 Jul. 1981; A. M. Carvalho 798; holotype: CEPEC [CEPEC 00024357]!; isotypes: CEPEC [CEPEC 00050811]!, NY [NY 00008356]!, U [U 0000334]!. Material examined BRAZIL – Bahia • “ Ilhéus, Distrito de Castelo Novo, fazenda Almada, coletas no km 4 na estrada para estação experimental do Almada e o povoado de Ribeira das Pedras, entrada no km 20 da rodovia Ilhéus / Uruçuca ”; [14 ° 39 ′ 18.7 ″ S, 39 ° 11 ′ 16.4 ″ W]; alt. 110 m; 8 Feb. 1996; L. A. M. Silva 3355; CEPEC [CEPEC 00070901]! • “ Uruçuca, Distrito de Serra Grande, 7.3 km na estrada Serra Grande / Itacaré, Fazenda Lagoa do Conjunto Fazenda Santa Cruz ”; 14 ° 25 ′ 23 ″ S, 39 ° 3 ′ 42 ″ W; 11 – 21 Sep. 1991; A. M. de Carvalho et al. 3602; CEPEC [CEPEC 00052187]!, HUEFS [HUEFS 013892]!, MBM [MBM 158839]!, NY [NY 00395805]!, US [US 01346587]! • ibid.; 14 ° 25 ′ 24 ″ S, 39 ° 3 ′ 38 ″ W; 15 Nov. 1995; W. W. Thomas et al. 11019; ALCB [ALCB 004564]!, CEPEC [CEPEC 00068119]!, MBM [MBM 194749]! • ibid.; 14 ° 25 ′ S, 39 ° 01 ′ W; 7 Sep. 1991; A. M. de Carvalho et al. 3649; CEPEC [CEPEC 00052143]!, HUEFS [HUEFS 013893]!, MBM [MBM 158840]!, NY [NY 00395807]! • ibid.; 1 – 12 Jul. 1991; W. W. Thomas 8041; NY [NY 00395804]! • ibid.; 1 – 12 Jul. 1991; A. M. de Carvalho 3350; ALCB [ALCB 004359]!, CEPEC [CEPEC 00052214]!, NY [NY 00395806]!, RB [RB 01351907]!, US [US 01346588]! • ibid.; 6 Oct. 1992; A. M. Amorim 794; CEPEC [CEPEC 00056662, NY [00395802]!, NY [NY 00395803]!, RB [RB 00042097]!, US [US 01346586]! • ibid.; 1 – 12 Jul. 1991; W. W. Thomas 6933; CEPEC [CEPEC 0005328]! • ibid., “ 7 km na estrada Serra Grande / Itacaré, local do Inventário Florestal ”; 10 Oct. 1995; A. M. de Carvalho et al. 6132; CEPEC [CEPEC 00066687]!, MBM [MBM 187066]!, NY [NY 00395801]! • ibid., “ rodovia BA- 001 Ilhéus / Itacaré, ca 4.5 km do distrito de Serra Grande ”; 5 Jul. 2001; J. G. Jardim 3721; NY [NY 00684332]!.
Name
- Homonyms
- Hornschuchia obliqua Maas & Setten