Citrus diversity in Roman Naples: pollen evidence for tangerines

The early history of Citrus fruits in the Mediterranean has been an active area of discussion amongst archaeobotanists, historians and palynologists in recent years. It has been well-established that citrons (Citrus medica) and lemons (Citrus limon) were known. For one thing they appear distinctively in Roman art, and for another their seeds are well known from Pompeii (e.g. Celant and Fiorentino 2018). What has been less clear is whether anything that we would call an orange today was known. Despite plausible textual sources, it is always hard to translate ancient terms into botanical species, especially in Citrus fruits that are so variety-rich, prone to both hybridization and frequent somatic mutations. So I have tended to think that some of the few orange-like seeds from Pompeii and from Rome, might just be outliers in the range of variation of early lemons (which are likely to have some pomelo and orange related ancestry in their South Asian origins (see, e.g. Fuller et al 2018). But an important new morphometric investigation of pollen of several Citrus species and archaeological pollen from Oplontis (near Pompeii) seems to have cleared this up. 

Lumaga et al. (2020) in a recent Vegetation History and Archaeobotany article, demonstrate the clear distinction in exine form, especially the cell or lumen size, that differentiates oranges (C. reticulata- the more primitive species, or less hybridized, of mandarin oranges or tangerines and similar small, sweet fruits). Much larger lumens characterize lemons. So I stand corrected on the Citrus diversity of Roman Italy: at least citrons, lemons and mandarins were grown.

This raises interesting questions about how these got to Rome. While these oranges were certainly known in China prior to the Han Dynasty, I have previously deduced that early orange in India-- known from Prakrit and Pali sources of the First Millennium BC-- naranga-- were perhaps most likely bitter oranges (Citrus aurantium), with sweet fruits coming later. Long distance transport of fruits from China to Rome strikes me as unlikely, so perhaps then there was more fruit diversity in northern Indian after all included under the rubrice of naranga, or other less obvious terms. Early South Dravidian languages (precursor to Old Tamil and Kannada) do seem to have two different kinds of oranges. This highlights all the more need for archaeobotanical investigations of early citrus (hidden in flots as charred rind fragments) throughout South Asia and Middle East in the Iron Age period.

I was recently interviewed about the history of Citrus fruits, especially oranges, in Europe in relation to how we can understand their use and symbolism in the writings of William Shakespeare: find the podcast here: That Shakespeare Life.

Dating archaeobotanical treasure troves from Armenia and Peru

The arrival of a new issue of Antiquity is always a welcomed event. The issue that arrived in my mail box this week a particular trove of treasures of an archaeobotanical sort. Not so much for archaeobotanical reports as such (the only such is the study by Willcox and  Strodeur on the details of Jerf el Ahmar), but for tantalizing new information of sites that have exceptional plant assemblages, or that one expects will in the future, like the Han era Pompeii, Sanyanzhuang (blogged below). Two sites, which are well-known for exceptional preservation are the Areni-1 cave complex in Aremenia (Areshian et al in Antiquity), left, and Huaca Prieta mound in coastal peru, below right (Dillehay et al.). 

     Areni made the news a couple of years ago for its early leather footwear, from ca. 3500 BC (Pinhasi et al in PLOSone), but it also has dessicated plant remains of many sorts: emmer and free-threshing wheat and barley, of course, but also lentil, grasspea, grapes, plums, walnuts, almonds and pears. How many of these fruit and nuts represent species that were available wild in the region, were under cultivation or introduced as cultivars still needs to be clarified. The site has produced features indicating on-site wine production, so presumably grapes were cultivated, from at least, from around 4000 BC. 4000 BC is associated with the earliest material reported so far, but the site still has much to yield to excavation, presumably including earlier material. Late samples from the past 2000 years include cotton and textiles.

     Huaca Prieta also boasts exceptional archaeobotanical preservation, and with a long sequence it provides information that suggests the chronology of cultivar introductions in this region. Few plants are likely to be native here and so their introductions point earlier cultivation and domestication elsewhere. This includes Cucurbita sqaush, avocado and lima bean at 7000-5500 BC, and thereafter the appearance of chillis and bottlegourds. Cotton cultivation was established around 4800 BC, and after 4500 BC maize was added to the repertoire. This is some of the best dated and documented early maize in South America, detailed of which were published earlier this year (see previous blog). Peanut, sweet potato and quinoa also come from later levels. Full details are not yet published but some summary can be found in the on-line supplement. This site has also produced coca leaves, indicating the long traditions of chewing this drug plant. Dillehay and colleagues reported the earliest for use of this drug, back to ca. 6000 BC, from elsewhere in northern Peru about a year and half ago, also in Antiquity. Intriguingly this drug plant, plausibly from across the Andes, appeared to already have domestication features at this date.

Fruitpedia

I just came across the on-line Fruitpedia, a compilation of basic information and photos of edible fruits from all over the world. Looks like a useful resource: http://www.fruitipedia.com/index.htm