Hoya tamdaoensis (Apocynaceae, Asclepiadoideae), a new species from Vietnam

Abstract

A new species of Hoya R.Br. from Tam Đảo National Park (Vĩnh Phúc Province, Vietnam), Hoya tamdaoensis Rodda & T.B.Tran, is described and illustrated. It is distinguished from the morphologically similar Hoya siamica Craib by corolla size, lamina shape, coloration, and orientation of the petioles.

Hoya longlingensis and H. sichuanensis (Apocynaceae), Two New Species from Southwestern China

“…Hoya longlingensis E.F. Haung is morphologically similar to H. tamdaoensis Rodda & T.B. Tran, a species reported recently from Vietnam [18]. Both H. longlingensis and H. tamdaoensis exhibit leaves wine-red when young, leaf apex usually caudate, petioles recurved, peduncle up to 10 cm long, corolla rotate and flat, ca.…”

“…2 cm in diameter, densely pubescent adaxially and glabrous abaxially, and margin recurved. However, H. longlingensis is an epiphytic liana and twining usually on the stems of other trees (Figure 1A), in contrast H. tamdaoensis is a lithophytic climber [18]. Additionally, H. longlingensis can be distinguished from H. tamdaoensis further by its lamina elliptic (Fig- Etymology.…”

“…In the past decade, multiple new species or newly recorded species of this genus have been discovered in Southwestern China resulting from extensive field investigations conducted [3][4][5][6][7][8][9][10][11]. Many new species of this genus were reported from the adjacent areas of China [12][13][14][15][16][17][18][19][20]. We collected two unidentified Chinese Hoya species in Sichuan and Yunnan provinces during our recent expeditions in 2018 and 2021.…”

Preliminary checklist of Hoya (Asclepiadaceae) in the flora of Cambodia, Laos and Vietnam

“…(Brown, 1810) includes 350-450 currently accepted species found throughout tropical Asia, tropical Pacific islands and NE Australia (Li et al, 1995;Forster, Liddle, 1996;Forster, 2006;Liddle, 2009;Rodda, 2015). Mainland southeast Asia and particularly the Indochinese Peninsula should be presently recognized as one of the richest areas of the genus species diversity with 41 species recorded up to now in Thailand (Thaithong, 2001;Kidyoo, Thaithong, 2007a, b), 32 species in southern China (Li et al, 1995), 26 species in Vietnam (Costantin, 1912;Pham, 2003;Tran, 2005;Tran et al, 2011a, b;Pham, Averyanov, 2012;Rodda et al, 2012Rodda et al, , 2015Pham et al, 2015), 19 species in Myanmar (Kress et al, 2003), 10 species in Lao PDR (Newman et al, 2007, Rodda, 2012Rodda et al, 2015) and five species in Cambodia (Costantin, 1912). Meanwhile, countries of eastern Indochina including Cambodia, Laos and Vietnam certainly rich in Hoya species remain up to the present study insufficiently studied.…”

“…globulosa, H. micrantha, H. oblongacutifolia, H. verticillata respectively. Table 1 Species of Hoya R. Br. reported in the flora of Cambodia, Laos and Vietnam (Costantin, 1912;Tran, 2005;Pham, 2003;Tran et al, 2011b;Pham, Averyanov, 2012;Rodda, 2012;Rodda, Simonsson Juhonewe, 2012a, b;Rodda et al, 2012Rodda et al, , 2015Pham, Averyanov 2012;Pham et al, 2015).…”