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6 results for “Dry-hot valley”
Data from: A novel case of autogamy and cleistogamy in Dendrobium wangliangii: a rare orchid distributed in the dry-hot valley
Dendrobium wangliangii is an epiphytic orchid distributed in the Jinshajiang dry-hot valley in Luquan County, Yunnan Province, China. Most Dendrobium spp. typically have a low fruit set, but this orchid shows a higher fruit set under natural conditions despite the lack of effective pollinators. The pollination biology of the critically endangered D. wangliangii was investigated in this study. A fruit set rate of 33.33±4.71% was observed after bagging treatment in 2017 and a high fruit set rate (65.72±4.44% in 2011; 50.79±5.44% in 2017) was observed under natural conditions, indicating that D. wangliangii is characterized by spontaneous self-pollination. The anther cap prevented the growing pollinium, thus the pollinium slid down and reached the stigmatic cavity, leading to autogamous self-pollination. Specifically, 51.50% of 162 unopened flowers (total 257 flowers) of this Dendrobium species under extreme water-deficit conditions developed into fruits, suggesting the presence of cleistogamy in D. wangliangii. Here, cleistogamy may represent the primary mode of pollination for this orchid. Spontaneous self-pollination and specific cleistogamous autogamy could represent major adaptions to the drought and pollinator-scarce habitat in the Jinshajiang dry-hot valley.
FIGURE 3. Senegalia propinqua. A. Fertile branches. B in Senegalia propinqua (Leguminosae: Mimosoideae), a new species from the Yuanjiang dry-hot valley in south-central Yunnan Province, China
FIGURE 3. Senegalia propinqua. A. Fertile branches. B. Terminal raceme with leaf primordia (arrows) at base of peduncles. C. Head (showing elongated receptacle, and flowers with pale-coloured calyx and corolla). D. New shoot showing spathulate stipules (arrows) subtending emergent leaves, and stem with dark reddish brown glandular hairs in narrow grooves. E. Vegetative bud, and branchlet showing numerous lenticels and scattered prickles. F. Leaf (with petiole broken so that petiole gland not visible). G. Leaflets (lower surface) showing main veins close to and parallel with upper margin. H–J. Petiole glands (plane view). K–L. Petiole glands (side view). Photos. Lin Bai
FIGURE 2. Senegalia propinqua. A. Habit. B in Senegalia propinqua (Leguminosae: Mimosoideae), a new species from the Yuanjiang dry-hot valley in south-central Yunnan Province, China
FIGURE 2. Senegalia propinqua. A. Habit. B. Stems (inset: prickles scattered on mature branches). C. Branches. Photos. Lin Bai
FIGURE 1. Senegalia propinqua. A in Senegalia propinqua (Leguminosae: Mimosoideae), a new species from the Yuanjiang dry-hot valley in south-central Yunnan Province, China
FIGURE 1. Senegalia propinqua. A. Leaf showing numerous leaflets per pinnae and position of petiole gland (thick arrow) and rachis gland (thin arrow). B. Leaflets (upper surface—left and lower surface—right) showing indumentum, vernation and main vein close to upper margin. C. Flowering branch with oblongoid heads in axils of mature and immature (arrowed) leaves. D. Stipules (outer surface— left and inner surface—right). E. Branchlet with minute, straight patent hairs and scattered prickles. F. Petiole glands (side view). G. Petiole glands (plane view). H. Flower (calyx and corolla opened artificially to expose gynoecium and numerous, free stamens). I. Corolla (abaxially—upper and adaxially—lower). J. Gynoecium showing densely hirsute ovary. K. Stamen. Drawn by Ding Han Cui (South China Botanical Garden); A, B, D–K are based on holotype and isotype specimens (L. Bai & Q. Tian BLSC-029); C is based on H. Zhu-Ge 10424 (SWFC [barcode 00007548]).
Data from: A novel case of autogamy and cleistogamy in Dendrobium wangliangii: a rare orchid distributed in the dry-hot valley
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FIGURE 4 in Senegalia propinqua (Leguminosae: Mimosoideae), a new species from the Yuanjiang dry-hot valley in south-central Yunnan Province, China
FIGURE 4. Map of southern China showing distribution of Senegalia propinqua and its three closest relatives (also showing major river systems, dry-hot and dry-warm valleys, and carbonate rock regions).
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