Page 52 - 《广西植物》2020年第10期
P. 52
10 期 黄翠莹等: 广东报春苣苔属一新种———黄进报春苣苔 1 4 3 5
Table 1 Diagnostic character differences between Primulina huangjiniana sp. nov. and its close relatives P. depressa
Characters P. huangjiniana P. depressa
Rhizome 0.5-2 cm longꎬ 2-5 mm in diameter 1-3.5 cm longꎬ 6-12 mm in diameter
Leaf blade Ovate to oblong ̄ellipticꎬ (2-) 3-7.5 ( -10) × Broadly lanceolate to oblongꎬ 8-20 × 3-7 cm
(1-) 1.5-4 ( -5.5) cm
Petiole (0.5-) 1-4 ( -7) cm long 4-10 cm long
Bracts 2.5-6 × ca. 1 mm 15-30 × 1.5-3 mm
Calyx lobes Subequalꎬ 6-12 × 1-1.5 mm Unequalꎬ 13-2 × 1.5-2 mm
Corolla 3.5-4 cm longꎬ abaxial lip 3 ̄partiteꎬ and lobes oblong 4.5-5 cm longꎬ abaxial lip 3 ̄lobedꎬ and lobes rounded
Filaments With glandular trichomes above the midpointꎬ Glabrousꎬ geniculate near the midpoint
geniculate near the base
Stigma Obdeltoidꎬ deeply 2 ̄lobedꎬ and lobes linear Lamelliformꎬ slightly 2 ̄lobedꎬ and lobes acute-triangular
Placenta Parietal placenta Axile placenta
Key to differentiate the new species and other species from
Mount Danxia of Guangdongꎬ China
1. Corolla yellowishꎬ smallerꎬ 12-15 mm long Primulina danxiaensis
1. Corolla non ̄yellowꎬ biggerꎬ≥25 mm long 2
2. Leaf blade margin serratus to dentate 3
2. Leaf blade margin entire 5
3. Peduncle 6-28 cm long or longerꎬ corolla inside purple ̄stained P. fimbrisepala
3. Peduncle ≤5 cm long or shorterꎬ corolla inside no purple ̄stained 4
4. Bracts 15-30 × 1.5-3 mmꎬ corolla 4.5-5 cm long P. depressa
4. Bracts 2.5-6 × ca. 1 mmꎬ corolla 3.5-4 cm long P. huangjiniana
5. Leaf blade orbicular ̄ovate to orbicular ̄reniformꎬ bracts narrowly triangularꎬ 4-6 × 0.8-1 mm
P. rotundifolia
5. Leaf blade ovate to elliptic or obovateꎬ bracts ovate to orbicular ̄ovateꎬ 10-45 × 8-28 mm
P. eburnea
Guangdong Province ( Hookerꎬ 1892)ꎬ but without piece of yellowish brown marking on the upper part of
detailed location. In factꎬ it is a very common species the interior of the corollaꎬ and a relatively smaller
on the moist rocks of Mount Danxiaꎬ but interestinglyꎬ capsules (less than ca. 1 cm long in length) compared
it never grows together with P. huangjiniana. It had to other Primulina species having large corolla which
been mistaken to be P. depressa before anatomical usually have longer linear capsules with the length 1-5
studies were done to find its parietal placenta differed cm ( except the previous Chiritopsis and Wentsaiboea
from P. depressa’s axile placenta. species). Howeverꎬ Primulina huangjiniana can be
The two species share some similar charactersꎬ readily distinguished from P. depressa by its slender
e. g. peduncles usually shorter than the petioles that rhizome (2-5 mm vs. 6-12 mm in diameter)ꎬ shorter
makes the flowers appear nestled among the leavesꎬ a leaf blade (3-7.5 cm long vs. 8-20 cm long) and bracts