Dorstenia stellaris
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Santos2012PhytoKeys12, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Santos2012PhytoKeys12">{{Citation See also the citation download page at the journal. |
Ordo: Rosales
Familia: Moraceae
Genus: Dorstenia
Name
Dorstenia stellaris A. Sant. & Romaniuc sp. nov. – Wikispecies link – IPNI link – Pensoft Profile
Diagnosis
Coenanthium ellipticum, irregulariter stellatum et lamina basis cordiformis differt.
Type
BRASIL. São Paulo, Pindamonhangaba, distrito de Ribeirão Grande, near Fazenda São Sebastião do Ribeirão Grande, 26 Nov. 2011, A. Santos et al. 142 (Holotype: SP!); Brasil. São Paulo, Pindamonhangaba, distrito de Ribeirão Grande, Fazenda São Sebastião do Ribeirão Grande, 30 Mar. 1994, I. Cordeiro et al. 1323 (Paratype: SP!); São Paulo, Pindamonhangaba, distrito de Ribeirão Grande, near Fazenda São Sebastião do Ribeirão Grande, 26 Nov. 2011, A. Santos et al. 143, 144, 145, 146 (Paratype: SP!).
Description
Camephytes 30–70 cm tall; stems aerial, erect, hirsute to tomentose; internodes 1–2.5 cm long.; latex white and abundant. Stipules 1–2 mm long., subulate, narrowly triangular, ciliate, persistent to deciduous, hairs white. Leaves distichous to whorled; blade 8–12 × 3.5–5 cm, membranaceous, apex long acuminate, base cordate, adaxial side scabrous, hairs sparse, white, abaxial side puberulous to hirsute, hairs gathered on the veins; margins entire to denticulate; petiole 2.5–5 cm long., hirsute; brochidodromous venation; 5–6 pairs of secondary veins; tertiary veins scalariform. Coenanthium elliptic, 1–2 cm diam., pateliform, stellate, 3–5 angulate, puberulous; margin with sessile bracts, 0.5–1 mm long., mostly on the angle apex, puberulous, fringes 0.5–0.7 mm alt., greenish to vinaceous; peduncle 1.5–2.5 cm long., puberulous. Staminate flowers distributed through the whole coenanthium; stamens 2; perianth 2 lobed. Pistilate flowers distributed through the whole coenanthium: perianth short lobed, whit apex minutely 2–3 lobed, puberulous; stigma 0.5–1 mm long., slender, white. Drupes elliptical, endocarp smooth to verrucosus; stigmas persistent. Seeds with a flat testa. {| class="wikitable" ; style="width: 100%"
|+ Table 1. Morphological comparison between Dorstenia species related to Dorstenia stellaris.
|-
! Taxa !! stellate coenanthium !! angulate coenanthium !! rounded coenanthium !! subulate stipule !! base cordate leaves !! base
acute leaves
|-
| Dorstenia stellaris || x || || || x || x ||
|-
| Dorstenia bowmaniana || || x || || x || || x
|-
| Dorstenia carautae || || x || || x || || x
|-
| Dorstenia milaneziana || || || x || x || x ||
|-
| Dorstenia setosa || || || x || x || x ||
|}
Phenology
Collected with flowers in march and november, and fruits in march.
Ecology
Dorstenia stellaris is a camephyte from shady and moist areas within the Atlantic forest, which occur in litter soils, near waterfalls inside forests of the type locality.
Similar species
The angulate shape of Dorstenia bowmaniana, and Dorstenia carautae coenanthium is similar to that Dorstenia stellaris, however, the differs on the strongly irregularly-stellate coenanthium and on the cordate leaves. Dorstenia milaneziana and Dorstenia setosa are also similar to Dorstenia stellaris by the cordate leaves, however, they differ from Dorstenia stellaris by the rounded coenanthium. The other species of the Lecanium section are mostly orbicular to elliptic coenanthium.
Distribution and conservation status
As Dorstenia stellaris is a newly described and very restricted taxon occurring in a non-conserved area, it warrants special attention with regard to its conservation status. This species has only been found within its type locality in small populations. We believe, indeed, that this species is endangered and following IUCN (2011) criteria we recommend its classification within the endangered status of conservation (EN).
Etymology
stellaris epithet refers to the irregularly-stellate shape of the coenanthium.
Original Description
- Santos, A; Neto, S; 2012: A new species of Dorstenia (Moraceae) from southeastern Brazil PhytoKeys, 12: 47-51. doi
Images
|
