Question: Which plant is known as a flowering plant and has columnar stems, Goodyera or Bamboo?

Context paragraphs:
Lastarriaea coriacea: Lastarriaea coriacea is a species of flowering plant in the buckwheat family known by the common name leather spineflower.  It is native to California and adjacent northern Mexico where it is a common plant of many habitat types.  This is an annual herb forming a patch of stems growing flat on the ground or rising slightly to a maximum height near 15 centimeters.  The small leaves are located basally, where the stems emerge from the ground.  They are generally hairy and linear in shape, and not more than 3 centimeters long.  The stems branch into wide inflorescences bearing pointed bracts and flowers with spiky awns.

Goodyera: Goodyera is a wide-ranging genus of orchids, one of approximately 900 described genera in the large and diverse flowering plant family Orchidaceae.  The genus "Goodyera" is named after the 17th-century botanist John Goodyer.

Ivesia pickeringii: Ivesia pickeringii is an uncommon species of flowering plant in the rose family known by the common names silky mousetail and Pickering's ivesia.  It is endemic to the Klamath Mountains of northern California where it is a plant of mountain meadows, often on serpentine soils.  This is a perennial herb forming tufts of long, erect leaves and thin, naked stems.  Each leaf is a taillike strip of overlapping lobed leaflets.  The reddish to greenish stems reach 30 to 50 centimeters in height and bear inflorescences of clustered flowers.  The stems, leaves, and inflorescences are all covered in fuzzy white to gray hairs.  Each flower is about a centimeter wide, with pinkish-green triangular sepals and longer, narrower pink or purple petals.  In the center of the flower are 20 stamens and a few pistils.

Senecio spartioides: Senecio spartioides is a species of flowering plant in the aster family known by the common name broom-like ragwort.  It is native to the western United States as far east as the Dakotas and Texas, and northern Mexico.  It can be found in dry, rocky, often disturbed areas in a number of habitat types.  It is a subshrub which can exceed a meter in height, its arching stems growing from a woody-topped taproot.  The leaves are linear in shape and up to 10 centimeters long.  The leaves usually have smooth, unlobed edges, but slightly lobed leaves are seen at times.  The leaves are evenly distributed along the stems, the ones low on the stems withering away early, giving the plant a naked appearance on the lower half while the top is still lush green and blooming.  The inflorescences are spreading, flat-topped arrays of many cylindrical flower heads.  The heads contain yellow disc florets and generally either 5 or 8 ray florets each about a centimeter long.

Bamboo: The bamboos are evergreen perennial flowering plants in the subfamily Bambusoideae of the grass family Poaceae.  In bamboo, as in other grasses, the internodal regions of the stem are usually hollow and the vascular bundles in the cross section are scattered throughout the stem instead of in a cylindrical arrangement.  The dicotyledonous woody xylem is also absent.  The absence of secondary growth wood causes the stems of monocots, including the palms and large bamboos, to be columnar rather than tapering.

Parodia magnifica: Parodia magnifica is a species of flowering plant in the Cactaceae family, native to southern Brazil.  It is a cactus growing to 7 - tall by 45 cm broad, with heavily ribbed, spherical to columnar, spiny and hairy stems, bearing pale yellow flowers in summer.

Rotala ramosior: Rotala ramosior is a species of flowering plant in the loosestrife family known by the common name lowland rotala.  This aquatic or semiaquatic plant is native to North America, where it grows in lakes, streams, and irrigation ditches.  The branching stems of the plant grow to about 40 cm long.  Leaves are decussate, arranged oppositely in perpendicular pairs along the stems.  The leaves are linear to lance-shaped to oval and up to 5 cm long.  Flowers occur singly in leaf axils.  Each has triangular sepals with long, narrow appendages and usually four tiny white petals in shades of pink to white.  This plant is sometimes grown in aquaria.

Lithospermum ruderale: Lithospermum ruderale is a species of flowering plant in the borage family known by the common name western stoneseed or lemonweed.  It is native to western Canada and the western United States, where it can be found in many types of habitat.  A perennial herb growing from a taproot and woody caudex, it is covered with fine, more or less upright, hairs, especially on the stems.  It produces a cluster of erect leafy stems 20 to 50 centimeters tall.  The stems support lance-shaped leaves up to 8 centimeters long.  Bunches of flowers with leaf-like bracts appear toward the top of the stem amongst the leaves.  The corolla is light yellow, often slightly greenish, and about a centimeter long and wide.  The style is short.  The fruit consists of one or two, sometimes four, clustered glossy grey nutlets, 3.5 to 6, sometimes as much as 8 mm long.  This plant was used as a contraceptive by several Native American groups, including the Navajo and Shoshone.  Studies on mice showed the plant reduced their fertility.

Pyrrocoma lanceolata: Pyrrocoma lanceolata is a species of flowering plant in the aster family known by the common name lanceleaf goldenweed.  It is native to western North America from central Canada to northeastern California to Colorado, where it grows in many types of habitat, including disturbed places and areas with wet, alkali soils.  It is a widespread and variable plant.  It is a perennial herb growing one or more stems up to about half a meter long.  The stems are decumbent or upright, reddish, usually somewhat hairy to quite woolly, and glandular toward the ends of the stems.  The largest leaves are at the base of the plant, each measuring up to 30 centimeters in maximum length.  They are generally lance-shaped with sawtoothed edges.  The inflorescence bears several, up to 50, flower heads lined with reddish to green phyllaries.  Each contains yellow disc florets and ray florets.  The fruit is an achene up to a centimeter long including its pappus.

Austrocactus coxii: Austrocactus coxii is a plant species in the genus "Austrocactus" from the cactus family (Cactaceae), indigenous to southern Argentina and southern Chile.  It grows as short columnar stems up to 5 cm diameter, reaching 60 cm in height, with 6-10 tuberculate ribs.  Central spines are hard, straight or slightly hooked, light brown to whitish and up to 4 cm long.  Thin spines are interwoven and range from 6 to 10 in number; each is up to 1 cm long.  Its diurnal red flowers are up to 3.5 cm in diameter.

Supporting paragraphs: Goodyera Bamboo
Answer: bamboos, to be columnar rather than tapering