This plant is part of the mostly tropical sandalwood family. The genus name Geocaulon is from the greek ge, earth, and caulos, stalk and is in reference to the long slightly subterranean but scarcely modified stems (Fernald 1970). Geocaulon species are hemi-parasites: that is, although they do produce their own food using chlorophyll like other green plants , they also obtain some nutrients by penetrating the roots of other plants.
There are 8 known and about 4 historical (not seen within 20 years) populations in New York State. Two of the historical populations were searched for without success, but more survey work is needed at these sites before they can be determined extirpated. All of the populations are limited to the highest mountains in the high peaks region of the Adirondacks and most are quite small. Some of the populations are threatened by trampling by hiker traffic. This species is at the edge of its range in New York, where the cool alpine habita it requires is very limited in distribution.
Most of the populations in New York were first seen within the past 20 years. This most likely is a result of these populations being overlooked due to the fact that this species is fairly inconspicuous and often grows in relatively small numbers. Most populations have under 100 individuals but there is no evidence that this is a result of declining populations.
No populations are known to have become extirpated in the past 100 or so years. There are two populations that were searched for recently without success. These populations have not been seen in the past 20+ years but further survey work is needed before these populations can be deemed extirpated.
Trampling by hiker traffic is a threat to some of the populations.
The Summit Steward program which works to inform hikers of the fragile nature of alpine plants is a critical program which is helping to reduce trampling of alpine vegetation. This program and other efforts designed to reduce trampling of alpine meadows are needed.
Consistent and clear estimates of population size are needed for all extant populations. The known populations of this species are small enough that counting of all stems is very possible. Populations which have not been seen recently need to be surveyed.
In New York, this species occurs in alpine meadows, under dwarfed trees in alpine and subalpine habitats, openings in krummholz, and high elevation bogs. It is sometimes found growing in mats of various ericaceous shrubs and it prefers wet, mossy microsites (New York Natural Heritage Program 2007). In Maine, it grows in Sphagnum bogs, coniferous woods, and alpine areas (Haines and Vining 1998). Sphagnum bogs and wet coniferous woods (Gleason and Cronquist 1991). Moss or damp humus (Fernald 1970).
In New York, Geocaulon lividum is restricted to some of the highest mountains in the high peaks region of the Adirondacks. All the populations are within about 14 air miles from each other.
This species occurs from Labrador to Alaska south to Maine, the mountains of northern New England and New York, Michigan, Minnesota, and southern British Columbia (Fernald 1970).
Purple comandra is a small herbaceous plant. It has creeping roots and erect simple stems that grow up to about one foot tall. The .4 - 1.6 inch long leaves are alternate on the stems. The flowers occur in clusters of 2-4 from axils of the leaves. They lack true petals but have a 5-lobed calyx with the lobes bronze to greenish. Only the central flower of a cluster has female reproductive parts and is able to produce fruits. The other flowers have only male reproductive parts. The beautiful orange to scarlet fruits are round, juicy, and 6-10 mm in diameter (Fernald 1970, Gleason and Cronquist 1991).
Geocaulon lividum often occurs in relatively small patches with the stems widely spaced. The stems are 7-30 cm tall. The creeping roots are smooth, filiform, and brown or reddish. The leaves are distinctive. They are 1-4 cm long, rounded at the apex, elliptic to oblong or narrowly ovate, and tinged or completely purplish to purplish-brown. The flowers occur in solitary clusters of 2-4 from the axils of the leaves in the middle of the stems. Only the central flower is perfect and develops into a scarlet fleshy fruit on a peduncle 1-2 cm long. These fruits are somewhat hidden by the leaves (Fernald 1970).
Identification of this species is possible with only vegetative characteristics but flowers or fruits are extremely useful and essentially needed for identification of dried specimens. In addition, the orange to scarlet fruits, although somewhat hidden by the leaves, can help greatly in the location of this species.
Geocaulon lividum is a very distinct plant and is not easily confused with any other species in New York's alpine habitats. Its flowers and to some degree fruits are somewhat inconspicuous. Individual stems often are without flowers. Therefore, as a simple-stemmed small herb that often grows singly or only in small groups, with stems widely spaced, it can be difficult to spot. Finding this species requires keen observation and familiarity with its vegetative characteristics.
Comandra umbellata, bastard-toadflax, looks similar vegetatively but occurs in lowland dry forests and barrens, and has many white flowers at the top of the stem.
The best time to survey for this species is when it is in fruit and it is most visible, which is from mid-July through September.
The time of year you would expect to find False Toadflax flowering and fruiting in New York.
Geocaulon lividum (Richards.) Fern.
Fernald (1928) transferred Comandra livida to the monotypic genus Geocaulon due to many morphological differences between the two genera.
Haines, A. and T.F. Vining. 1998. Flora of Maine, A Manual for Identification of Native and Naturalized Vascular Plants of Maine. V.F.Thomas Co., Bar Harbor, Maine.
Fernald, M.L. 1928. Contributions from the gray herbarium of Harvard University, No. LXXIX. Rhodora 30: 21-30.
Fernald, M.L. 1950. Gray's manual of botany. 8th edition. D. Van Nostrand, New York. 1632 pp.
Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York. 910 pp.
Holmgren, Noel. 1998. The Illustrated Companion to Gleason and Cronquist's Manual. Illustrations of the Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York.
Mitchell, Richard S. and Gordon C. Tucker. 1997. Revised Checklist of New York State Plants. Contributions to a Flora of New York State. Checklist IV. Bulletin No. 490. New York State Museum. Albany, NY. 400 pp.
New York Natural Heritage Program. 2010. Biotics database. New York Natural Heritage Program. New York State Department of Environmental Conservation. Albany, NY.
New York Natural Heritage Program. 2020. New York Natural Heritage Program Databases. Albany, NY.
Reschke, Carol. 1990. Ecological communities of New York State. New York Natural Heritage Program, New York State Department of Environmental Conservation. Latham, NY. 96 pp. plus xi.
Weldy, T. and D. Werier. 2010. New York flora atlas. [S.M. Landry, K.N. Campbell, and L.D. Mabe (original application development), Florida Center for Community Design and Research http://www.fccdr.usf.edu/. University of South Florida http://www.usf.edu/]. New York Flora Association http://newyork.plantatlas.usf.edu/, Albany, New York
Zika, Peter F. and Jerry C. Jenkins. 1992. Contributions to the flora of the Adirondacks, New York. Bulletin of the Torrey Botanical Club 119(4): 442-445.
Information for this guide was last updated on: January 31, 2008
Please cite this page as:
New York Natural Heritage Program. 2020. Online Conservation Guide for Geocaulon lividum. Available from: https://guides.nynhp.org/false-toadflax/. Accessed January 17, 2020.