“Behavioural studies in the twenty-first century have sought to provide a better understanding of the mechanisms by which bees forage. We know now that they do not ‘see’ shapes or objects but instead detect parameters and recognise places, and by using their 300-degree vision they are able to triangulate on just a few clues in order to find food. The patterns that we see in the flowers around us have evolved to play to such perception, and as our understanding of both plant and pollinator increases we are able to gradually unfold more details of the complex relationships that have formed between them…. “The yellow and black of the Rudbeckia petals is a useful clue to help us understand how bees respond to the colour signals from plants, as it tells us that the contrast between colours plays a significant role. There appears to be yet more evidence for the importance of this colour contrast, in the way that non-floral parts of the plant are seen, or not seen, by bees. As the green parts of a plant must be able to absorb light from the sun in order to photosynthesise, much of the UV light that falls on the leaves and stem is absorbed by pigments such as flavanoids and chlorophyll. As a result, for an animal who sees predominantly in the UV region of the spectrum, green vegetation appears almost black. The effect of this is that the UV-reflecting parts of flowers are heightened by the black background, making them more obvious to certain pollinators.”
“The name [Rudbeckia] was bestowed by Linnaeus, in honor of his teacher at Uppsala University in Sweden, Olof Rudbeck the Younger, and his father, Olof Rudbeck the Elder. It is the dark centres to these golden-yellow daisies which draw us to them — hence, the common name black-eyed Susans (coneflower is another). There are 23 species, all rapidly growing herbaceous perennials and all native to North America, largely the midwestern and eastern U.S. states….
“Rudbeckias are generalists, growing in a wide range of both open and lightly shaded habitats, from virgin prairie to waste ground, but preferring moister and more fertile soils. Of the species in cultivation, Rudbeckia hirta and R. triloba are short-lived non-clonal perennials, often members of pioneer communities; the remainder are clonal and competitive, often strongly spreading, although not always persistent. Rudbeckias have had a minor role in Native American medicine, sometimes as a substitute for echinacea.”
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Last week I went hunting at Oakland Cemetery’s gardens for some of the tiny, colorful asters that I’ve previously photographed around this time of year (see, for example Autumn Asters (1 of 3), Autumn Asters (2 of 3), and Autumn Asters (3 of 3)). I was a little too early, as it turns out, finding only tiny buds not yet ready to open — but I did come across some substantial gatherings of the flowers featured in the images below. The first three photos will give you some idea of the flower volume: a bloom-forest teaming with moths, bees, and other wee pollinators bouncing among the “eyes” of these flowers.
Black-eyed Susans (Rudbeckia hirta) and Brown-eyed Susans (Rudbeckia triloba) are members of the Asteraceae family — so I guess I actually did find asters, just not the ones I was looking for. Wikipedia lists other common names for the plants, including Coneflower, Brown Betty, Gloriosa Daisy, Golden Jerusalem, English Bull’s Eye, Poor-Land Daisy, Yellow Daisy, and Yellow Ox-eye Daisy — and many of these names likely have some fun historical roots and local usages. I did asked one of the AI tools if the name “Susan” in “Black-eyed Susan” once referred to any specific person, and here’s what I sort-of learned from ClaudeAI:
There are a few theories about the origin of the “Susan” part of the name Black-eyed Susan, but unfortunately there is no definitive evidence pinpointing exactly who Susan refers to. Here are some of the main theories:
One belief is that it was named after an English woman called Susan who frequently handed out flowers, including rudbeckias. This may explain the flower’s association with cheerfulness and hospitality.
A common legend says it was named by European settlers for a native Algonquin woman who helped them learn wildflower names. This speaks to its native North American origins.
Some think it may be biblical in origin and refer to Susanna from the Book of Daniel in the Old Testament.
There are unverified references to individual women named Susan in colonial America for whom the flower was informally named.
It may simply refer generically to the archetype of a strong, plainspoken woman, as Susan sometimes represented in folk culture.
Unfortunately there is no solid evidence for any of these possibilities over the others. The name was in use by the late 1700s, but the exact inspiration remains mysterious. So while the “Susan” in Black-eyed Susan is vivid, the specific person or meaning behind it has been lost to history.
It was an overcast day when I took these photos, which made the flowers glow against their dark green backgrounds, and the filtered light accentuated a color shift from yellow toward a more saturated orange. The “eyes” actually vary in color and include both black and dark brown, which helped me differentiate Black-eyed from Brown-eyed Susans. The brown eyes reflect more yellow or orange shades from the flower than the black ones, on which you may see bits of blue color along with the black.
“[Lantana] is not particular as to soil, provided the exposure is sunny, and also that the soil is well supplied with moisture at least until a fair growth has been made. When well established the plants do not seem to mind drought, and continue bright and attractive in the hottest weather. They should not be transplanted out in the open before danger of frost is over. If the old plants are wanted for propagation, cut them back and transfer to pots early in September, and when they start into new growth the soft wood will furnish cuttings that root easily. Keep young stock in a warm position through the winter months, and repot in April….
“Save the old plants, after frost has nipped their freshness late in autumn, prune severely back, remove them indoors, giving them a temperature anywhere above 40 degrees, and with a little attention and fresh soil, every plant will be a perfect specimen, covered with blooms in May.…
“Gardeners train them into fine standards, as prim and shapely as need be.”
“This family consists mainly of shrubs and trees, and many herbaceous members of the family are slightly shrubby in growth. Most of them have square stems and leaves in opposite pairs, and most of them are distinctly aromatic, having a strong smell when handled or crushed, sometimes a pleasant scent, and in some cases a disagreeable odour. One of the best known species in this country is Lantana camara, a straggling, very prickly bush, originally introduced from America; this has spread widely over large areas of the country and is now declared a noxious weed. It has quite pretty, circular heads of orange and red flowers followed by black berries, but it is held responsible for a number of cases of cattle poisoning. It is also encroaching rapidly onto grazing lands, and an effort is being made to eradicate it entirely.
”Lantana angolensis is an erect, unbranched plant of up to fifty centimetres in height, flowering early in the year, and common in woodland clearings and on waste land. The stems are square, hairy, and woody towards the base, and the leaves grow on short stalks, either in pairs or in whorls of three around the stem. They are narrowly oval with a slight point, evenly toothed around the edges and hairy on both surfaces. The tiny, bright mauve flowers are borne in axillary and terminal clusters, half a dozen or so in a cluster surrounded by a ring of green bracts, the whole on a short, hairy stalk. More noticeable than the flowers and more attractive are the juicy, bright purple berries which follow them; these are much enjoyed by many kinds of birds.”
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This is the last of three posts featuring lantana from my garden; the first post is Lantana camara ‘Mary Ann’ (1 of 3) and the second post is Lantana camara ‘Mary Ann’ (2 of 3). Here I adjusted cropping and recast some of the previous photos on black backgrounds. They always look like colorful pieces of candy to me when rendered this way; and, as it turns out, there are lantana varieties with “candy” in the name — including cotton candy, candy crush, and candy-candy!
