Question: Which of the following is a herb known to grow in Eurasia: Rehderodendron or Thlaspi?
Context: Agave eggersiana, Eggers' century plant, is an endangered species of spiky plant which grows in the Virgin Islands, in dry, exposed areas.  "Agave eggersiana" is a perennial herb known in the wild only from the island of St. Croix of the U.S. Virgin Islands (USFWS 1998a).  A small number of plants remain on private land and are threatened by tourist development (USFWS 1998b).  Other threats include feral pigs and goats on National Park Service land (USFWS 1998b).  Research needs include distribution and abundance, general biology and ecology (USFWS 1998a).  The U.S. Fish and Wildlife Service requests that any interested parties (concerned government agencies, the scientific community and/or industry) submit data or suggestions concerning this species (USFWS 1998b).  The plant is being cultivated at the St. George Village Botanical Garden in St. Croix U.S.V.I.(USFWS 1998a) and at Fairchild Botanical Gardens in south Florida. Lathyrus sphaericus is a species of wild pea known by the common names grass pea and round-seeded vetchling.  It is native to Eurasia and much of Africa, and it is known on other continents as an introduced species.  It can grow in many types of habitat, including disturbed areas.  This is an annual herb producing a slender stem and bearing leaves each made up of two long, narrow, grasslike leaflets up to 6 centimeters long and a coiling, climbing tendril.  The inflorescence is made up of one pea flower on a stalk one or two centimeters long ending a in a bristle.  The flower is roughly a centimeter long and deep orange-red or dull red in color.  The fruit is a hairless legume pod marked with longitudinal stripes. Camassia scilloides is a perennial herb known commonly as Atlantic camas, wild hyacinth, and eastern camas.  It is native to the eastern half of North America, including Ontario and the eastern United States. Minuartia obtusiloba (formerly "Arenaria obtusiloba") is a perennial alpine herb known by the common names alpine sandwort and twinflower stitchwort.  It is native to the mountains of western North America from the High Sierra of California to the Colorado Rockies north to Alaska.  Its range may extend into far eastern Russia.  This is a low plant forming mats or clumps and bearing small thimble-shaped flowers with curving white petals. Tanacetum balsamita is a perennial temperate herb known as costmary, alecost, balsam herb, bible leaf, or mint geranium. Plantago aristata is a species of plantain known by the common name bracted plantain or largebracted plantain.  It is native to the eastern and central United States, and it can be found in other parts of North America as well as parts of Eurasia as an introduced species.  It grows in many types of habitat, including disturbed areas, where it is a minor weed.  It is an annual herb usually lacking a stem, producing a circular rosette of many narrow linear leaves each up to 15 centimeters long.  The stemlike inflorescences grow erect to a maximum height around 30 or 35 centimeters tall.  Atop the peduncle of the inflorescence is a dense spike of many small flowers each with four whitish lobes a few millimeters long.  Between the flowers are long, narrow bracts which may be 3 centimeters long, the defining characteristic of the species.  The bracts have fluffy hairs around their bases near the flowers. Rehderodendron is a genus of five species of flowering plants in the family Styracaceae, native to southeastern Asia, from southwestern China south to Myanmar and Vietnam. Chlorogalum parviflorum is a species of perennial herb known by the common name smallflower soap plant. Thlaspi, or pennycress, is a genus of herbs of temperate regions of the Eurasian continent.  They occur in Central and South Europe, South-West Asia and 2 species are endemic to China.  The "Thlaspi" has been proven to be a hyperaccumulator of heavy metals such as zinc and cadmium and therefore may be used in phytoremediation initiatives. Schoenoplectus mucronatus (syn.  "Scirpus mucronatus") is a species of flowering plant in the sedge family known by the common names bog bulrush, rough-seed bulrush, and ricefield bulrush.  It is native to Eurasia and Africa it is known on other continents as an introduced species and sometimes a weed.  It is a weed of rice fields in California.  It grows in moist and wet terrestrial habitat, and in shallow water.  It is a perennial herb growing from a short, hard rhizome.  The erect, three-angled stems grow in dense clumps and reach a meter tall.  The leaves take the form of sheaths wrapped around the base of stem, but they generally do not have blades.  The inflorescence is a headlike cluster of cone-shaped spikelets accompanied by an angled, stiff bract which may look like a continuation of the stem.
Answer: Thlaspi