''Toiyabea granitica'', common names granite serpentweed and Lone Mountain serpentweed, is a rare endemic plant species known only from the east side of Lone Mountain in

Esmeralda County Esmeralda County is a county in the southwestern portion of the U.S. state of Nevada. As of the 2020 census, the population was 729, making it the least populous county in Nevada. Esmeralda County does not have any incorporated communities. Its ...

Nevada Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. N ...

, about 20 km (12.5 miles) west of Tonopah. It grows there in the crevices of

granitic A granitoid is a generic term for a diverse category of coarse-grained igneous rocks that consist predominantly of quartz, plagioclase, and alkali feldspar. Granitoids range from plagioclase-rich tonalites to alkali-rich syenites and from quart ...

outcrops. ''Toiyabea granitica'' is a perennial herb growing close to the ground and forming mats. Leaves are ovate to

spatulate The following is a list of terms which are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (a single leaf blade or lamina) or compound (with several leaflets). The edge of the leaf may be regular o ...

, irregularly toothed, up to 4 cm (1.6 inches) long. Flower heads are born in

racemose A raceme ( or ) or racemoid is an unbranched, indeterminate type of inflorescence bearing flowers having short floral stalks along the shoots that bear the flowers. The oldest flowers grow close to the base and new flowers are produced as the s ...

corymb Corymb is a botanical term for an inflorescence with the flowers growing in such a fashion that the outermost are borne on longer pedicels than the inner, bringing all flowers up to a common level. A corymb has a flattish top with a superficial re ...

iform arrays. There are no

ray flower The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

s, but up to 23 yellow

disc flower The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae we ...

s.Cronquist, A.J. 1994. Asterales. 5: 1–496. In A.J. Cronquist, A. H. Holmgren, N. H. Holmgren, J. L. Reveal & P. K. Holmgren (eds.) Intermountain Flora. Hafner Publishing Co., New York.

References

{{Taxonbar, from1=Q106910081, from2=Q15559589 Astereae Flora of Nevada