Considerable variation in size and shape of leaves occurs, and although to some extent regional in nature, intergradation is complete; recognition of infraspecific taxa is unwarranted. A few collections from isolated areas on the Pacific Coast of Canada are noteworthy, however. Those are small, few-flowered plants with rather narrow leaves borne alternately or suboppositely toward the base of the stem, as in some Asiatic species. They are in some respects very similar to Platanthera freynii Kränzlin, an Asiatic species distinguished primarily by its abruptly narrowed petals, in contrast to the generally broader, but variable, petals in North American plants. These western plants warrant further study to establish their identity and to elucidate relationships between North American and Asiatic species.
Platanthera orbiculata, the round leaved orchid[2] or lesser roundleaved orchid,[3] is a species of orchid native to forested areas of North America. It is widespread across most of Canada and parts of the United States (Alaska, New England, Appalachian Mountains, Great Lakes Region, Rocky Mountains, Black Hills and northern Cascades).[1][4]
There is two accepted subspecies, Platanthera orbiculata var. macrophylla and Platanthera orbiculata var. orbiculata.[5]
Platanthera orbiculata is found in moist to mesic shaded locations in forests. Each plant has two large, nearly round leaves that lie close to the ground, plus a vertical flowering stalk bearing a spike of small, white flowers.[1]
Platanthera orbiculata, the round leaved orchid or lesser roundleaved orchid, is a species of orchid native to forested areas of North America. It is widespread across most of Canada and parts of the United States (Alaska, New England, Appalachian Mountains, Great Lakes Region, Rocky Mountains, Black Hills and northern Cascades).
Platanthera orbiculata là một loài thực vật có hoa trong họ Lan. Loài này được (Pursh) Lindl. miêu tả khoa học đầu tiên năm 1835.[2]
Platanthera orbiculata là một loài thực vật có hoa trong họ Lan. Loài này được (Pursh) Lindl. miêu tả khoa học đầu tiên năm 1835.