The following Participating Institutions are custodians for this species in the CPC National Collection:
Cincinnati Zoo & Botanical Garden
The conservation of Tuctoria greenei is fully sponsored.
Holly Forbes contributed to this Plant Profile.
Greenes tuctoria is an annual grass species found only in vernal pools. It grows in tufts of several stems, which are erect or decumbent and break easily at the base. The entire plant tends to be pilose, but is only slightly viscid. The stems are usually 5 to 15 centimeters (2.0 to 5.9 inches) tall and are not branched. Plants have purplish nodes and leaves no wider than 5 millimeters (0.20 inch). The inflorescence can be as much as 8 centimeters (3.1 inches) long; it may be partly hidden by the leaves when young, but is held above the leaves at maturity. (Recovery Plan).
Distribution & Occurrence
Greenes tuctoria has been found in three types of vernal pools: Northern Basalt Flow, Northern Claypan, and Northern Hardpan on both low and high terraces. (Recovery Plan).
|22 occurrences are believed to be extant. The number of individuals varies dramatically from year to year. Fourteen localities of this species remain unprotected and all of these sites are on private lands. (5-year Review)|
Conservation, Ecology & Research
At the Vina Plains Preserve, frequent associates of Greenes tuctoria are Eryngium castrense and Marsilea vestita. Elsewhere in the Sacramento Valley and in the San Joaquin Valley, Greenes tuctoria often grows in association with Eryngium vaseyi, Plagiobothrys stipitatus, and Alopecurus saccatus (foxtail). The rare Chamaesyce hooveri co-occurs with Greenes tuctoria at eight sites in the Sacramento Valley. Other rare plants that grow in the same vernal pools with Greenes tuctoria at a few occurrences are: Orcuttia pilosa, O. inaequalis, O. tenuis, Neostapfia colusana, and Gratiola heterosepala (Recovery Plan).
Competition with non-native species
Inappropriate livestock grazing
Seeds have been collected at localities in Tehama and Glenn counties, and will continue to be collected in subsequent years at other localities. Seeds will be deposited at an appropriate seed storage facility. (Recovery Plan).
The majority of the localities of Greenes tuctoria do not have management plans, monitoring programs, or adequate funding to ensure that these localities are sustainable in perpetuity. (5-Year Review)
Keeley, J.E. 1988. Anaerobiosis as a stimulus to germination in two vernal pool grasses (Tuctoria greenei and Orcuttia californica). American Journal of Botany. 75: 1086-1089.