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Plant Details

Magnolia grandiflora

Southern Magnolia, Bull Bay

Scientific Name:

Magnolia grandiflora

Common Name:

Southern Magnolia, Bull Bay

Plant Family

Magnoliaceae (Magnolia Family)

Native/Alien:

Native

Type:

Evergreen Tree

Bloom Color(s):

white

Size in Feet:

60 to 90 ft

Light:

full-sun, part-sun

Soil Moisture:

mesic(*)

Bloom Time:

May - June

Bloom Area:

Coast

Habitat Description:

Maritime forests, mesic Coastal Plain bluffs and flats,bottomlands, now also widely naturalized, spreading from cultivation into wet to mesic forests.  The pre-Columbian range was apparently from se. NC south to c. peninsular FL, west to e. TX, largely on the Coastal Plain, now somewhat expanded northward and inland by naturalization from centuries of horticultural planting. Curtis (1860) states that “the northern limit of this tree is in Brunswick County, south of the Cape Fear; but it flourishes in cultivation through all the lower part of the State.”

Flower

Magnolias are an ancient genus with a "primitive" arrangement of flower parts. The white tepals are lowermost, held open in a bowl-shape. Above them on a cone-like structure are whorls of stamen with the carpels at the top. This structure has been thought to be beetle-pollinated.

image

Paynter, Wilmington, June 2013

Flower Close-up

The curly stigma (female parts) at the top with the stamen (male parts) below

image

Paynter, Wilmington, May 2014

Nectar drops on stigma

Despite the accepted thinking that beetles are the main pollinators of Southern Magnolia, research by Larry Allain suggests that Southern Magnolias and bees, especially honeybees and some Sweat Bees, interact to pollinate the trees. When a flower first open, UV patterns, fragrance and nectar attract bees to the reflexed stigma.

image

Same flower, next day, showing pollen.

On the second day, the production of nectar stops and the anthers produce large amounts of pollen that fall into the petals, attracting bees and beetles. The flowers will stay open for 1 or 2 more days, gradually losing fragrance, UV reflectivity and pollen viability. Note the pollen that now adheres to the stigma above, likely the result of cross-pollination the day before.

image

Fruit with dangling red seeds

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Links:

USDA PLANTS Database Record


Bird-Friendly Native Plants



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