A revision of the family Petrosaviaceae in Vietnam

Abstract

The family Petrosaviaceae is represented by two species in Vietnam, viz. Petrosavia sakuraii restricted to the northern part of the country and P. stellaris distributed in its southern part. The latter species is shown to possess a wide range of distribution in Vietnam, though it was previously believed to be an exclusively Malesian species. The inclusion of P. sinii in P. sakuraii is confirmed. Details on distribution, illustrations and an identification key for these species are provided.

Nichima gen. nov. (Alismataceae) based on reproductive structures from the Oligocene‐Miocene of Mexico

“…For example, the fossils have a broad, flat pedicel, perianth differentiated into sepals and petals, the petals caducous, and a superior ovary. In contrast, the flowers of Petrosaviaceae have a narrow receptacle and a semi‐inferior ovary (Remizowa et al, 2017). Butomaceae shares with the fossil samples the pedicellate and bisexual flowers with the biseriate perianth, free multi‐vasculature sepals shorter than petals, six lobed stamens, superior ovary, and sessile stigmas (Simpson 2019).…”

“…Further comparison of the fossil material with the extant Alismataceae genera or species that have similar morphological characters was based on publications on floral morphological and developmental information, such as those by Kaul (1967), Argue (1973), Chanda et al (1988), Thulin (1995), McCullough (1997), Haynes et al (1998a, b), Cook (1998), Charlton (1999), Cameron et al (2003), Novelo (2003), Kozlowski et al (2008), Lehtonen (2009), Li and Zhou (2009), Furness and Banks (2010), Lehtonen and Gordon (2010), Allen (2015), de Egea Elsam (2015), Hazarika and Borthakur (2015), Remizowa et al (2017), Stevens (2001), Iwamoto et al (2018), Jiménez (2018), Lehtonen (2018), Leme et al (2021), and Chen et al (2022). Finally, the fossil specimens were also compared to flowers of extant Alismataceae through direct observation of herbarium materials (Herbario Nacional de Mexico‐MEXU and Herbario Jerzy Rzedowski‐QMEX).…”

Pollination biology of a rare serpentine plant, Japonolirionosense (Petrosaviaceae)

“…This study indicates that Japonolirion and Petrosavia have contrasting mating systems because Petrosavia can produce seeds through autonomous self‐pollination, whereas J . osense is dependent on cross‐pollination for seed production (Takahashi et al 1993, 2021, Remizowa et al 2017). Protogyny, the sequential dehiscence of anthers, and stigmatic movements within a flower, are involved in the autonomous self‐pollination in P. sakuraii (Takahashi et al 1993).…”

“…To date, research on the pollination biology of Petrosaviales has been limited. Petrosavia species can produce seeds through autonomous self-pollination (Takahashi et al 1993, Remizowa et al 2017. Diptera and Hymenoptera have been recorded visiting the flowers of P. sakuraii in a Japanese population, suggesting that these insects enhance self-and cross-pollination (Takahashi et al 1993).…”

“…To date, research on the pollination biology of Petrosaviales has been limited. Petrosavia species can produce seeds through autonomous self‐pollination (Takahashi et al 1993, 2021, Remizowa et al 2017). Diptera and Hymenoptera have been recorded visiting the flowers of P .…”