Serotinal

Soon, however, the allantois undergoes changes of development looking towards the formation of the placenta at the base of the ovum, where the chorionic villi becomes more and more developed, the serotinal tissue growing toward and around them and encapsulating them, while at the same time the vessels of the serotinal layer become dilated to form the material system of placental blood-supply.

The inner (chorionic) surface [of the placenta] exhibits ramifications of the umbilical vessels, and is closely covered on its fœtal side by the amnion; from its placental (outer, serotinal) side multitudes of arborescent vasculi villi arise[…].

The psoraleas, prairie clovers and blazing stars would probably occur to all us among the most the most abundant of the secondary species in the vernal, estival and serotinal aspects of the prairies respectively.

Whenever societies are well developed, they regularly manifest a fairly definite seasonal sequence, producing what have long been known as aspects[…]. As phenomena of the growing season, these were first distinguished as early spring or prevernal, vernal proper, estival, and serotinal or autumnal, but there may also be a hiemal aspect, especially for animals, in correspondence with an actual and not merely a calendar winter as in California.

My knuckles and my bony wrists / show early signs of drying out; / […] / The night condenses into me, allays / the bonds of my serotinal blight. / Count Dracula and I share in this flight: / we seek moist shadows underneath the quays, / in marrow-darkness bid our bodies twist.

In these population dynamic trends obvious differences exist between the aestival and serotinal aspects.

Botanists use the word serotinous to describe late-blossoming, and serotinal refers to the late-summer season of the year, especially used in descriptions of life-histories of freshwater organisms[…].

Cutting across the wide range of seasonal systems in different countries, ecologists have their own more-or-less universal system, at least in temperate regions, for describing animal behaviour. There are six of these ecological seasons, […] Late summer, serotinal, is from mid-February to mid-March, still in my summer but breaking into Vivaldi autumn. […] [I]t doesn't gel with me as a way of tracking the seasonal changes here in Australia.