Marah fabaceus
| Marah fabaceus | |
|---|---|
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| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Rosids |
| Order: | Cucurbitales |
| Family: | Cucurbitaceae |
| Genus: | Marah |
| Species: | M. fabaceus |
| Binomial name | |
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Marah fabaceus (Naud.) Greene |
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Marah fabaceus, the California manroot or bigroot, is the most common of the manroot species native to California. Its range throughout the state subsumes nearly the entire ranges of all the other California native manroots species and intergrades. Hybrids between California manroot and the other species are common.
Like other manroots, Marah fabaceus has stout, hairy stems with tendrils. Vines appear in late winter in response to increased rainfall, and can climb or scramble to a length of 6 meters. Its leaves typically have five lobes with individual plants showing wide variation in leaf size and lobe length.
Vines emerge from a large, hard tuberous root which can reach several meters in length and weigh in excess of 100 kilograms. Newly exposed tubers can be seen along roadcuts or eroded slopes and have a scaley, tan-colored surface. Injured or decaying tubers take on a golden or orange color.
The flower can vary in colour from yellowish green to cream to white. Flowers appear soon after the vine emerges. The flowers are monoecious, that is, individual flowers are either male or female, but both sexes can be found on the same plant. Male flowers appear in open clusters while females flowers, distinguished by a swollen base, usually appear individually. The plant is self-fertile; pollen from the male flowers can fertilise the female flowers on the same plant. Pollination is by insects.
The fruit is spherical, 4 to 5 centimeters in diameter, and covered in prickles of variable density, up to 1 centimeter long but without hooks. Unripe fruit are bright green, ripening to yellow. The fruit swells as it ripens until finally rupturing and releasing the large seeds. Fruit begin to form in spring and ripen by early summer. It is not suggested that the fruit is eaten as it can induce vomiting and diarrhea.
Seeds of the California manroot are large, hard, and very smooth. Fruit usually hold 4 or more seeds. Seeds sprout in the cool wetness of late winter. Seeds have an intriguing germination process. The initial shoot emerges from the seed and grows downward into the earth. This shoot then splits, one part beginning to swell and form the tuber, while the second part grows back to the surface and becomes the vine.
The California manroot grows most vigorously by streams or in washes but is also successful in dry chaparral, at elevations up to 1600 metres. It ranges through most of California except the far northwest and the Mojave Desert. It will tolerate a variety of soil types and acidities, but it requires seasonally moist soil. Vines can grow in full-sun to partially shaded conditions. In mild areas where year-round moisture is available, vines can be perennial. In the Mediterranean climate areas of California, manroot emerges soon after winter rains begin, grows until late spring, and dies back completely in the heat and dryness of summer.
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Wikipedia