The St. John’s Wort Family is a cosmopolitan family of plants with six to nine genera and about 700 species. They may be annual or perennial and they exist as herbaceous, shrub and tree species.
The citrus family is a large family which includes herbaceous plants, shrubs and trees. They are mostly native to the tropical zones of the world and they include the well-known foods of the Citrus genus, such as limes, oranges, lemons and grapefruits.
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The spurge family is large, having 218 genera and around 6,745 species. They have a worldwide distribution with most in the tropical zones where they exist as forbs, shrubs or trees. In North America, they primarily exist as forbs. Due to the fascinating phenomenon of convergent evolution, some species strongly resemble cacti. But they are far removed from the cactus family.
Passion Flowers (Passion Vines) are members of the family Passifloraceae and are quite common on Wafer Creek Ranch where two species have been identified, purple passionflower, Passiflora incarnata, and yellow passionflower, Passiflora lutea.
Purple Passion Vine Passiflora incarnata
Yellow Passion Flower Passiflora lutea
The milkweed subfamily contains 348 genera distributed almost worldwide. Our milkweeds of genus Asclepias that exist in the North American temperate zones are forbs having toxic sap, containing cardenolide in the stems and leaves that are poisonous to animals except for the milkweed insects, for which the plants serve as the larval host. Such is the case for the imperiled Monarch butterfly, as well as the Queen butterfly and several species of moth.
The legumes are exceptionally important plants of the grassland woodland ecosystem because they are a very important food source for animals. They produce nectar from the flowers and protein from the seeds (the peas and beans). The legume seeds (the beans and peas) tend to hold their protein content longer than the grasses and other forbs in late winter. In addition, they enrich the soil by their symbiosis with nitrogen fixing bacteria (rhizobia and other bacteria) within the root nodules of the plant. The rhizobia take nitrogen from the air and convert it to nitrogenous compounds, such as ammonia, nitrate and nitrogen dioxide usable by plants, including the host legume, and other organisms.
Legumes represent the third largest terrestrial plant family on Earth, following the orchid and sunflower families.
Now that we have completed the brief survey of the grasses (family Poaceae) of the shortleaf pine-oak-hickory woodland grassland we can move on to the forbs. Forbs are non-grass, non-woody plants, which basically means that they are not trees, shrubs or grasses. On the other hand, herbaceous plants include the forbs along with the grasses.
In this post I will continue the list of the salient warm season grasses of the shortleaf pine-oak-hickory woodland. However, I remind you that there are numerous other grass species that are part of the ecosystem, so these seven grasses (three listed in the previous post and four in this one) represent only a few important “poster children” of the system.
Johnny Armstrong, Author
#Biodiversity advocate. Ecosystem Restorationist. Steward of an old-growth forest and woodland in northern Louisiana. #ForestFolkMatter #ScienceMatters
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