The oldest public wildflower garden in the United States
Helianthus maximiliani Schrad.
Historical - not extant
Late summer to autumn flowering
Maximilian Sunflower is a tall, erect, native perennial forb growing on branching hairy ridged stems from 5 to 7 feet high. The stem hair are short and fine giving a grayish-whitish color cast.
The leaves are all stem leaves, mostly alternate. The shape is lanceolate, 3x as long as wide, conduplicate, with 1 main nerve from a wedge-shaped leaf base which tapers to a very short stalk winged stalk. Leaf size decreases on the upper stem. Leaf margins are entire, the upper surface stiff and rough, the lower leaf surface will be rough from dense fine stiff hairs and is gland-dotted. The upper surface has a gray-green appearance due to the surface hair.
The floral array is a loose branched raceme-like cluster of 3 to 15 long-stalked hemispherical flower heads at the top of the stem with additional arrays branching from the upper leaf axils. Individual flower stalks are up to 4 inches long.
The flowers are composite, about 1-3/4 to 2 3/4 inches wide when open, consisting of an outer ring of 10 to 25 ray florets, which are not fertile; these have pale yellow rays, 25 - 40 mm long. The back surface of the ray floret laminae are not gland-dotted. These surround an inner disc of 75+ bisexual fertile tubular disc florets with deeper color yellow corollas that have five triangular throat lobes which spread when the floret opens. The five stamens of each disc floret have dark brown to black anthers which tightly surround a branched yellow style with an appendage that is usually yellow. Stamens and style are exserted from the tube when the floret opens. The flower head is hemispheric in shape surrounded with 30 to 40 green phyllaries, in several series, that are lanceolate in shape, loosely arranged or spreading, with pointed tapering tips. The margins of the phyllaries are usually finely hairy as is the outer surface, and gland-dotted.
Seed: Mature disc florets produce a dry cylindrical shaped brownish cypsela, 3 - 4 mm long, with a pair of awl-shaped awns on the top - no fluffy pappus. Seeds require 30 days of cold stratification for germination. If planted in the autumn, winter will do the work.
Habitat: Maximilian Sunflower grows from a rhizomatous root system that allow the plant to spread vegetatively and form colonies. Do not plant where you cannot control the spread. It needs full sun, and mesic to dry conditions. Various soils are tolerated, from sandy well drained to clays. Taller plants may need staking or the support of other plants. Powdery mildew and rust may affect the plants under certain conditions.
Names: The genus Helianthus is from two Greek words, helios for 'sun' and anthos for 'flower.' The species maximiliani is an honorary for Maximilian A. P. zu Wied-Neuwied (1732-1867), a German prince who traveled and collected in Brazil in 1815-17 and then in North America on his famous journey to the interior when he met the indigenous peoples and recorded aspects of the landscape, of which Karl Bodmer, who accompanied him, completed the famous set of North American Prints that Maximilian had published by Ackerman in 1840.
The author name for the plant classification, ‘Schrad.’ refers to Heinrich Adolf Schrader (1767-1836), German botanist, who taught at the University of Gottingen and wrote Nova genera plantarum and Flora germanica. The genus Schraderanthus is named for him. The description was published in 1834, the same year that Maximilian completed his North American work. It is not unreasonable to believe that Maximilian brought a specimen of this previously unclassified plant back to Germany with him for Schrader to use and this resulted in the honorary species name.
Comparisons: This species has similarities to H. giganteus (Giant Sunflower) which is also a tall plant, but with little stem branching. The fine grayish-white hair on stems and leaves, the long slim phyllaries and the one-nerved leaf which tends to fold at the nerve are good identification keys.
Above: The floral array of Maximilian Sunflower. Drawing from Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York.
Below: 1st photo - Ray flowers number 10 to 25. 2nd photo - the phyllaries are spreading, long pointed tips and with edge and back side fine hair.
Below: Disc florets number 75+ with 5 triangular lobes on the throat. The black anthers are tightly appressed to the style.
Below: Stem leaves are 3x as long as wide with stiff short hair on both sides and one central vein, along which the leaf can fold.
Below: 1st photo - the ridged stem also has fine stiff hair. 2nd photo - underside of the leaf.
Below: Flower clusters arise from the stem top and side branches from the lead axils.
Notes: Maximilian Sunflower is not indigenous to the Garden but was first planted by Eloise Butler in 1912 with plants sourced from Horsfords Nursery in Charlotte, VA. She then planted twice in 1914 with plants from Mendota MN and from Western Avenue near the Garden. Her last plantings were in 1916 and 1917. It was still in the Garden at the time of Martha Crone's 1951 census, but she made no notes of ever planting it.
Maximilian Sunflower is native to Minnesota and is still found in 54 counties spread throughout the state. In North America it is generally found from the Rocky Mountains eastward to the coast except for Florida, Georgia, Louisiana and parts of New England. In Canada it is known in the lower provinces except the Maritime area. There are a total of 12 species of Helianthus native to Minnesota.
The other species of Helianthus currently in the Garden are: H. giganteus, Giant Sunflower; H. hirsutus, Stiff-haired Sunflower; H. pauciflorus, Stiff Sunflower; H. strumous, Paleleaf Woodland Sunflower; and H. tuberosus, Jerusalem Artichoke.
References: Plant characteristics are generally from sources 1A, 32, W2, W3, W7 & W8 plus others as specifically applied. Distribution principally from W1, W2 and 28C. Planting history generally from 1, 4 & 4a. Other sources by specific reference. See Reference List for details.
Identification booklet for most of the flowering forbs and small flowering shrubs of the Eloise Butler Wildflower Garden. Details Here.
Friends of the Wild Flower Garden, Inc. Text and photos are by G. D. Bebeau unless otherwise credited. "www.friendsofthewildflowergarden.org"