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Morus Rubra (Red Mulberry)

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Morus Rubra (Red Mulberry) Morus rubra L. redred mulberry mulberry, Page 1 State Distribution Photo by Ryan P. O’Connor Best Survey Period Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec Status: State threatened extant, with no population data available, whereas 10 occurrences, the most recently documented and Global and state rank: G5/S2 observed, consist primarily of small colonies of trees, typically comprised of three or fewer individuals. Family: Moraceae (mulberry family) Recognition: Red mulberry is a small to medium- Synonym: Morus rubra var. tomentosa (Rafinesque) sized tree of forested floodplains and adjacent slopes, Bureau with a rounded, dense canopy and short trunk (Barnes and Wagner 2004). The bark is a dark-reddish brown, Taxonomy: Closely related to the non-native Morus separating into narrow, loose, flat strips and shallow, alba (while mulberry), with which it is known to flat fissures. The leaves are alternate on delicate, zigzag hybridize. See further comments under the conservation branches, and are very similar in size and shape to the and management section below regarding hybridization leaves of basswood (Tilia). In contrast to basswood, and its potential threat to populations of red mulberry. the leaves of red mulberry are roundish to ovate and symmetrical ( lacking the strongly lopsided leaf Range: Red mulberry is a widely distributed species base in basswood), have a roughened (scabrous) of the central and eastern United States and Canada, upper leaf surface, and are uniformly downy-hairy occurring from southern Ontario to Vermont and south beneath. Red mulberry also produces lobed leaves, to Florida, and ranging to the west from South Dakota to with one or two or more lobes, though such lobed Texas. It is considered rare in Massachusetts, Ontario, leaves tend to form on strong shoots, such as from basal and Vermont, and is presumed extirpated in the District sprouts. of Columbia (NatureServe 2007). Other than a superficial resemblance to basswood, State distribution: This tree species is restricted to the Morus rubra is most likely to be confused with the southern Lower Peninsula, where it is known primarily non-native white mulberry, with which it is closely from the southwest and southeast regions. Of the nearly related and may also hybridize. White mulberry is a 25 occurrences documented from a total of 13 counties, relatively ubiquitous species that occurs in a variety 11 sites are known only from historical records. Of of habitats, particularly in disturbed sites and in urban the remainder, four occurrences are considered to be environments, but may occur with red mulberry. In Michigan Natural Features Inventory P.O. Box 30444 - Lansing, MI 48909-7944 Phone: 517-373-1552 red mulberry, Page 2 contrast to red mulberry, the bark of white mulberry Biology: Morus rubra is a wind-pollinated, dioecious has a markedly orange to yellowish-orange color and species (i.e. consisting of male and female individuals). generally smaller leaves (which may present similarly The fruits, which are animal-dispersed, are multiples lobed forms) with a glossy upper surface and a smooth of tiny drupes (a drupe being a fleshy fruit with a lower surface with hairs, if present, only along the main stone-like seed) consolidated into blackberry-like veins. aggregations termed “syncarps. Stiles (1980) included red mulberry in a study of the patterns of woody plant Best survey time/phenology: Although the fruits may fruit presentation and seed dispersal in the eastern be helpful in identification, this species is most reliably deciduous forest, classifying this species as a “summer, distinguished by its leaves, and thus plants can be small-seeded fruit” type. Fruit dispersal was recorded determined from leaf flush to leaf drop, approximately as occurring from June to August, thus occurring from late May through early October. prior to the fall migration of frugivorous birds, with dispersal occurring principally through mammals FQI Coefficient and Wetland Category: 9, FAC- and resident birds. In a study of forest succession in floodplains, Bellah and Hulbert (1974) reconstructed the Habitat: In Michigan red mulberry is almost always successional sequence on exposed alluvial substrates, found within or near riparian areas, typically in noting that red mulberry, along with American elm, red floodplain forest communities or in mesic to dry- ash, and box elder became established within the first 10 mesic forests in close proximity to river and stream years of alluvial soil exposure, attaining co-dominance drainages, especially along fertile slopes (Barnes and within 60 years and reaching its optimal basal area and Wagner 2004). Characteristic woody plant associates importance values in 30-60 year old stands. include such species as Fraxinus pennsylvania (red ash), Ulmus americana (American elm), Tilia Conservation/management: Little is known about americana (basswood), Quercus macrocarpa (bur oak), the status of a significant number of documented sites Liriodendron tulipifera (tuliptree), Acer negundo (box for this species. However, several sites are protected elder), Gymnocladus dioicus (Kentucky coffeetree), on public land, including a state game area, a state Acer nigrum (black maple), Quercus alba (white oak), park, and at least two southeastern Metro Parks with Q. rubra (red oak), Celtis occidentalis (hackberry), high quality riparian habitat. The species is also Platanus occidentalis (eastern sycamore), Carya protected in at least one Nature Conservancy preserve cordiformis (bitternut hickory), and Acer saccharinum and a Michigan Nature Association sanctuary. Despite (silver maple). Common understory plants may protection within these sites, significant threats remain typically include Cercis canadensis (redbud), Staphylea due to excessive and illegal off-road-vehicle (ORV) use trifoliata (bladdernut), Euonymus atropurpurea and other human activities. There are also immediate (wahoo), Asimina triloba (pawpaw), Carpinus threats due to a number of invasive plant species caroliniana (musclewood or bluebeech), Toxicodendron well known as aggressive competitors in floodplains, radicans (poison ivy), and Vitis riparia (riverbank particularly garlic mustard (Alliaria petiolata), dame’s grape), and groundcover species such as Laportea rocket (Hesperis matronalis), moneywort (Lysimachia canadensis (wood nettle), Lysimachia ciliata (fringed nummularia), honeysuckles (Lonicera spp.), tree-of- loosestrife), Euonymus obovata (strawberry bush), heaven (Ailanthus altissima), and the non-native white Verbesina alternifolia (wingstem), Asarum canadense mulberry. (wild ginger), Eupatorium rugosum (white snakeroot), and Rudbeckia laciniata (cut-leaved coneflower), among Comments: Hybridization with white mulberry many other taxa typical of the rich diversity in southern has been reported extensively in Ontario, where red floodplain forests. mulberry occurs along a portion of the northern range edge, and according to Ambrose (1999) most Ontario Elsewhere within its wide range, red mulberry occurs sites for red mulberry co-occur with white mulberry. in a variety of forest types, particularly moist forests, Genetic studies conducted by Burgess et al. (2005) thickets, ravines, and bottomlands, and may also confirmed a relatively high degree of hybridization, with commonly occur in hedgerows and other successional the hybrids expressing a dominance of white mulberry habitats (Flora of North America 1997, Ambrose 1999). markers in their genome and thus the potential (owing Michigan Natural Features Inventory P.O. Box 30444 - Lansing, MI 48909-7944 Phone: 517-373-1552 red mulberry, Page 3 to introgression, or repeated backcrossing) for the Flora of North America Editorial Committee. 1997. genetic dilution of red mulberry. Preliminary fitness Flora of North America, North of Mexico. tests between red and white mulberry and their hybrids Volume 3: Magnoliophyta: Magnoliidae and demonstrated that red mulberry was outperformed in Hamamelidae. Oxford Univ. Press. New York, both sun and shade environments, corroborating the NY. 590 pp. need for management to cull white mulberry (Ambrose 1999). It was also shown in a test plot that the removal NatureServe. 2007. NatureServe Explorer: an online of white mulberry and hybrids resulted in an increased encyclopedia of life [web application]. Version number of true breeding red mulberry fruits. Michigan 6.1. NatureServe, Arlington, Virginia. Available populations of red mulberry should thus be monitored http://www.natureserve.org/explorer. (Accessed: to determine the presence of white mulberry and the September 11, 2007). detection of possible hybrids. Stiles, E.W. 1980. Patterns of fruit presentation and seed Research needs: Status surveys to determine dispersal in bird-disseminated woody plants in the condition and extent of known and historical the eastern deciduous forest. Amer. Nat. 116: populations are perhaps the principal need at present, 670-688. and should include an assessment of threats, including the proximity of white mulberry and any evidence or Voss, E. G. 1985. Michigan Flora. Part II. Dicots potential for hybridization. (Saururaceae-Cornaceae). Bull. Cranbrook Inst. Sci. 59 and Univ. of Michigan Herbarium. xix + Related abstracts: Floodplain forest, black rat snake, 724 pp. Blanding’s turtle, eastern box turtle, Indiana bat, red-shouldered hawk, beak grass, goldenseal, prairie trillium, Virginia snakeroot, wahoo, yellowfumewort, Abstract citation: and many additional species in this rich natural natural community
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