Note on the Structure and Affinities of Parnassia palustris, L.

Bennett, Alfred W.

doi:10.1111/j.1095-8339.1869.tb00052.x

Cited by 5 publications

(4 citation statements)

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“…Another affiliation of Parnassia was suggested with Sauvagesia (Ochnaceae) because both have peculiar pseudonectaries (e.g. Bennett, 1869) and parietal placentae. A separate family for Parnassia with relationships to Droseraceae, Saxifragaceae and Hypericaceae was proposed by Drude (1875) and supported by Arber (1913) and Sharma (1968).…”

Section: Systematics Of Celastralesmentioning

confidence: 99%

Comparative floral structure and systematics in Celastrales (Celastraceae, Parnassiaceae, Lepidobotryaceae)

Matthews

Endress

2005

Botanical Journal of the Linnean Society

101

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Floral morphology, anatomy and histology in the newly circumscribed order Celastrales, comprising Celastraceae, Parnassiaceae and Lepidobotryaceae are studied comparatively. Several genera of Celastraceae and Lepidobotrys (Lepidobotryaceae) were studied for the first time in this respect. Celastraceae are well supported as a group by floral structure (including genera that were in separate families in earlier classifications); they have dorsally bulged-up locules (and thus apical septa) and contain oxalate druses in their floral tissues. The group of Celastraceae and Parnassiaceae is also well supported. They share completely syncarpous gynoecia with commissural stigmatic lobes (and strong concomitant development of the commissural vascular bundles but weak median carpel bundles), only weakly crassinucellar or incompletely tenuinucellar ovules with an endothelium, partly fringed sepals and petals, protandry in bisexual flowers combined with herkogamy by the movement of stamens and anther abscission, and stamens fused with the ovary. In contrast, Lepidobotryaceae are more distant from the other two families, sharing only a handful of features with Celastraceae (not Parnassiaceae), such as pseudohermaphroditic flowers, united stamen bases forming a collar around the gynoecium and seeds with a conspicuous aril. However, all three families together are also somewhat supported as a group and share petals that are not retarded in late floral bud development, 3-carpellate gynoecia, ventral slits of carpels closed by long interlocking epidermal cells and pollen tube transmitting tissue encompassing several cell layers, both integuments usually more than two cell layers thick, and only weak or lacking floral indumentum. In some molecular analyses Celastrales form an unsupported clade with Malpighiales and Oxalidales. This association is supported by floral structure, especially between Celastrales and Malpighiales. Among Celastrales, Lepidobotryaceae especially share special features with Malpighiales, including a diplostemonous androecium with ten fertile stamens, epitropous ovules with an obturator and strong vascularization around the chalaza.

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Section: Systematics Of Celastralesmentioning

confidence: 99%

Comparative floral structure and systematics in Celastrales (Celastraceae, Parnassiaceae, Lepidobotryaceae)

Matthews

Endress

2005

Botanical Journal of the Linnean Society

101

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“…Sequential stamen movements have been observed in several families, including Loasaceae, Rutaceae, Celastraceae/ Parnassiaceae and Tropaeolaceae (Ren, 2010;Henning and Weigend, 2012;Ren and Tang, 2012). In Parnassia, stamen movements have been noted in P. palustris in Europe over two centuries, for example by Sprengel (1793), Gris (1868), Bennett (1869), Arber (1913) and Martens (1936). These authors observed that the five anthers presented pollen one by one at the flower centre on different days and then bent away and down to overlie the petals before the stigma was exposed.…”

Section: Introductionmentioning

confidence: 99%

In the right place at the right time: Parnassia resolves the herkogamy dilemma by accurate repositioning of stamens and stigmas

et al. 2013

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“…With new vision, the vision of our grandmothers, we might discern the transgressive potential of our pests, "figure[s] full of contradiction" that urge us to resist reading the lifecycles of pests, and by extension the lifecycles of the poor, as defined by social death. 91 Instead, we might view such strivings as a hardship that is exhausting, yet also restorative. 92 We might even see this same striving within ourselves: men, women, and children motivated by an inner fight to thrive when societal temptations threaten to lure us down the beaten path.…”

Section: * * *mentioning

confidence: 99%

For Every Rat Killed

Toussaint¹

2022

CAL

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If my grandmother had survived the sickness of old age and were alive to witness the economic injustices wrought by capitalist culture, what would she think? If my grandmother were alive to observe familiar technologies for exterminating household pests—surveillance, capture, imprisonment, disposal—being increasingly aimed toward low-income Black communities, what would she believe? If my grandmother were alive to discover, in the palm of her hands, a digital platform for spreading information (and misinformation) to the masses and painting new futures into the minds of lawmakers and politicians, what would she say? Studies have shown that low-income individuals are more likely to suffer physiological and psychological harms than middle- and high-income individuals due to the substandard conditions of their communities. Yet, such indignities are justified by market opportunities to grasp for better—to take “personal responsibility” and “pull yourself up by the bootstraps”—even when the process of grasping for upward social mobility inflicts its own trauma. This Essay explores the trauma of grasping for better in the United States where wealth inequities only seem to be getting worse. In so doing, it considers whether capitalism’s competitive and individualistic culture—a spirit that thrives on the exploitation of the weak to further the capital accumulation of the strong—not only normalizes violence as a mechanism for social mobility but sews division and strife where alternative futures, perhaps even Afro-futures, might finally set us all free.

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Note on the Structure and Affinities of Parnassia palustris, L.

Cited by 5 publications

References 0 publications

Comparative floral structure and systematics in Celastrales (Celastraceae, Parnassiaceae, Lepidobotryaceae)

Comparative floral structure and systematics in Celastrales (Celastraceae, Parnassiaceae, Lepidobotryaceae)

In the right place at the right time: Parnassia resolves the herkogamy dilemma by accurate repositioning of stamens and stigmas

For Every Rat Killed

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