. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. Phlox andicola Nuttall ex A. Gray PLAINS PHLOX Phlox Family (Polemoniaceae) CONSERVATION STATUS U. S. Fish and Wildlife Service: None Bureau of Land Management: Watch Montana Natural Heritage Program: G4 S1; apparently secure globally, but may be critically imperiled in Montana where it is extremely rare. Results of 1997 studies provided a basis for changing the state rank. DESCRIPTION: Plains phlox is a perennial herb with loose tufted stems that are 4-10 cm (1 -4 i
. Botanical and vegetation survey of Carter County, Montana, Bureau of Land Management-administered lands . Botany; Rare plants. Phlox andicola Nuttall ex A. Gray PLAINS PHLOX Phlox Family (Polemoniaceae) CONSERVATION STATUS U. S. Fish and Wildlife Service: None Bureau of Land Management: Watch Montana Natural Heritage Program: G4 S1; apparently secure globally, but may be critically imperiled in Montana where it is extremely rare. Results of 1997 studies provided a basis for changing the state rank. DESCRIPTION: Plains phlox is a perennial herb with loose tufted stems that are 4-10 cm (1 -4 in) high, sometimes forming mats, and arising from creeping rhizomes. The 5-8 pairs of opposite, linear leaves have prominent midveins, whitish bases and are 10-25 mm long, ca. 1 mm wide, and come to a sharp point. Foliage is glabrous to sparsely hairy and the stem is distinctly white. The 1 -5 flowers are white to pale pinkish or blueish, with a tubular corolla 12-15 mm long, and 5 spreading, well-rounded lobes, 6-9 mm long. The loose inflorescence is borne at the stem tips. There are usually 5 stamens and a single style, which is 5-9 mm long, with a 3-lobed stigma. The calyx is 6-11 mm long, tubular with 5 herbaceous, hairy, pointed lobes (costae) which are separated by whitish membranes, and with a tangle of pubescence along the lobes. The calyx is shorter than the corolla. Flowering in May-early June. Alyssum-leaved phlox {Phlox alyssifolia) has 2-5 mm wide, more elliptic leaves. Hoodis phlox {Phlox hoodii) has usually shorter leaves (less than 10 mm long) and, on the average, narrower leaves and smaller corolla tube and calyx. The latter also has calyx length about equaling the corolla tube length. Dimensions of the largest/! hoodii specimens may overlap with those of the smallest/! andicola specimens. Flowering material is needed for definitive identification. Phlox andicola Plains Phlox GEOGRAPHICAL DISTRIBUTION Global distribution: Great Plains; from southwest North Dako
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