''Ibervillea sonorae'' is a

tuber Tubers are a type of enlarged structure used as storage organs for nutrients in some plants. They are used for the plant's perennation (survival of the winter or dry months), to provide energy and nutrients for regrowth during the next growing ...

ous

perennial A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wide ...

plant in the

Cucurbitaceae The Cucurbitaceae, also called cucurbits or the gourd family, are a plant family consisting of about 965 species in around 95 genera, of which the most important to humans are: *''Cucurbita'' – squash, pumpkin, zucchini, some gourds *''Lagena ...

family known by the common names wereke, wareque, guarequi, and coyote melon. It is a highly variable species characterized by a large,

succulent In botany, succulent plants, also known as succulents, are plants with parts that are thickened, fleshy, and engorged, usually to retain water in arid climates or soil conditions. The word ''succulent'' comes from the Latin word ''sucus'', meani ...

tuberous root, which in the dry sand of its native habitat resembles a gray, dust-covered boulder. Emerging from the root yearly are long, flexible

liana A liana is a long- stemmed, woody vine that is rooted in the soil at ground level and uses trees, as well as other means of vertical support, to climb up to the canopy in search of direct sunlight. The word ''liana'' does not refer to a ta ...

-like shoots, which reach a length of three or more meters. This species is native to northwestern

Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...

, being found in the states of

Baja California Baja California (; 'Lower California'), officially the Free and Sovereign State of Baja California ( es, Estado Libre y Soberano de Baja California), is a state in Mexico. It is the northernmost and westernmost of the 32 federal entities of Mex ...

Baja California Sur Baja California Sur (; 'South Lower California'), officially the Free and Sovereign State of Baja California Sur ( es, Estado Libre y Soberano de Baja California Sur), is the least populated state and the 31st admitted state of the 32 federal ent ...

Sonora Sonora (), officially Estado Libre y Soberano de Sonora ( en, Free and Sovereign State of Sonora), is one of the 31 states which, along with Mexico City, comprise the Administrative divisions of Mexico, Federal Entities of Mexico. The state is d ...

and

Sinaloa Sinaloa (), officially the Estado Libre y Soberano de Sinaloa ( en, Free and Sovereign State of Sinaloa), is one of the 31 states which, along with Mexico City, comprise the Administrative divisions of Mexico, Federal Entities of Mexico. It is d ...

Description

plant with a large

ous rootstock that resembles a boulder, shoots emerge annually with bright green leaves and have

dioecious Dioecy (; ; adj. dioecious , ) is a characteristic of a species, meaning that it has distinct individual organisms (unisexual) that produce male or female gametes, either directly (in animals) or indirectly (in seed plants). Dioecious reproductio ...

flowers and reddish or orangish fruits. The fruits are not bad smelling, but are unpalatable as they are very bitter.

Morphology

This plant has an enormous tuberous rootstock, filled with water and nutrients, which gives it marked vitality in the xeric environment. The large, succulent tuber blends in well with its arid habitat, with the irregularly shaped gray tuber giving the effect of stone. In spring,

shoot In botany, a plant shoot consists of any plant stem together with its appendages, leaves and lateral buds, flowering stems, and flower buds. The new growth from seed germination that grows upward is a shoot where leaves will develop. In the spri ...

s may emerge, dying back in fall and emerging again the next year. The long, flexible

-like shoots bear

leaves A leaf (plural, : leaves) is any of the principal appendages of a vascular plant plant stem, stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", wh ...

and

tendril In botany, a tendril is a specialized stem, leaf or petiole with a threadlike shape used by climbing plants for support and attachment, as well as cellular invasion by parasitic plants such as ''Cuscuta''. There are many plants that have tendr ...

s, and may reach a length of 3 m or more. The shoots are round, smooth, and green above, while gradually blending back into the tuber below. The tendrils are branched. On the shoots are the leaves, which are twice 3-cleft, colored bright green and lacking leaf glands. The

flowers always appear with leaves, the male flowers in

raceme 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 ...

s and the female flowers solitary. The flowers open early in the morning, after dawn, and close in the afternoon. The

petal Petals are modified Leaf, leaves that surround the reproductive parts of flowers. They are often advertising coloration, brightly colored or unusually shaped to attract pollinators. All of the petals of a flower are collectively known as the ''c ...

s are yellow. The fruits of the plant are about to long, and colored reddish to orange, "amber colored."

Taxonomy

The first description of this species was by

Sereno Watson Sereno Watson (December 1, 1826 in East Windsor Hill, Connecticut – March 9, 1892 in Cambridge, Massachusetts) was an American botanist. Graduating from Yale in 1847 in Biology, he drifted through various occupations until, in California, he j ...

, as ''Maximowcizia sonorae'' in 1889.

Edward Palmer Edward Palmer may refer to: * Edward Palmer (d.1624) (1555–1624), antiquary and projector of a university in Virginia * Edward Palmer (socialist) (1802–1886), American religious socialist * Edward Palmer (Canadian politician) (1809–1889), Pri ...

had previously found this plant in

Guaymas Guaymas () is a city in Guaymas Municipality, in the southwest part of the state of Sonora, in northwestern Mexico. The city is south of the state capital of Hermosillo, and from the U.S. border. The municipality is located on the Gulf of Califo ...

in 1887.

Edward Lee Greene Edward Lee Greene (August 20, 1843–November 10, 1915) was an American botanist known for his numerous publications including the two-part ''Landmarks of Botanical History'' and the describing of over 4,400 species of plants in the American W ...

created the genus ''Ibervillea'', as the name ''Maximowiczia'' had already been previously used to describe a taxon. Greene then named this species ''Ibervillea sonorae''.

Distribution and habitat

This species is distributed throughout portions of northwestern

. On the Baja California peninsula, it is found in extreme southeast

Baja California state Baja California (; 'Lower California'), officially the Free and Sovereign State of Baja California ( es, Estado Libre y Soberano de Baja California), is a state in Mexico. It is the northernmost and westernmost of the 32 federal entities of Mex ...

from the vicinity of the Sierra de La Libertad south to the Cape region of

and on various islands adjacent to the peninsula. It is also found throughout

, and in

References

{{Taxonbar, from=Q15535986 Flora of Northwestern Mexico Cucurbitaceae Flora of Baja California Sur Flora of Baja California Flora of Sonora Flora of Sinaloa Endemic flora of Mexico Taxa named by Edward Lee Greene