annual, one-year, perennial

biannual, triennial, quadrennial, annual, yearly, quinquennial, biyearly, inaugural, showpiece, bimonthly, olympiad, semiannual, weeklong, triennium, convenes, invitational, centenary, event, decennial, congress, jubilee, exhibitions, festival, curtain raiser, organizers, cospar, daylong, plenary, intergovernmental, excon, interschool, symposium, eliminatory, budget, diamond jubilee, midyear, culminates, preparatory, convention, conferences, exposition, chronogram, tercentennial, auspices, indra, sponsored, hosted, calendar, organized, silver jubilee, oceanian, whitsuntide, venue, wushu, colloquia, governing body, surf fishing, expo, competitions, quincentenary, nast, fana, national, confab, biennium, fest, scheduled, polycentric, extravaganza, tendence, nonpartisan, moas, joint, anglomania, sesqui, augural, saengerfest, monthlong, intercollegiate, interclub, fiesta, quadrennium, continental, jota, quadricentennial, alea, midwinter, tricentennial, ilia, quasquicentennial, bacchanalian, billed, leitmotiv, commissioned, chairing, penultimate, ramanavami, exhibitors, periodical, callithumpian, jamboree, intertraffic, perennial, colloquium, cen, conference, corps, edition, perennials, regiment, vol, climber, rib, workshop, ad, d., edit, plenum, precinct, vine, quarterly, forthcoming, fortnightly, biweekly, weekly, bicentennial, septennial, followup, multiyear, week

african holly, alkanet, allium, anchusa officinalis, angelica archangelica, anthriscus sylvestris, archangel, asphodeline, barbarea, beet, beta vulgaris, blazing star, blessed thistle, bugloss, burdock, california fern, caltrop, camelina, campanula medium, canterbury bell, carduus crispus, centauria calcitrapa, cheiranthus allionii, cheiranthus asperus, chinese forget-me-not, clotbur, common beet, common evening primrose, common foxglove, conium maculatum, corn, cotton thistle, cow parsley, cultivated parsnip, cup and saucer, cynoglossum amabile, cynoglossum officinale, descurainia, digitalis purpurea, dyer's woad, erysimum allionii, erysimum arkansanum, erysimum asperum, fairy bell, finger-flower, finger-root, fingerflower, fingerroot, garden angelica, garden forget-me-not, genus allium, genus angelica, genus asphodeline, genus barbarea, genus camelina, genus descurainia, genus hesperis, genus lepidium, genus mesembryanthemum, genus ranunculus, genus sisymbrium, german rampion, hemlock, hesperis, hoary plantain, holy thistle, hound's-tongue, isatis tinctoria, lady's thistle, lepidium, lychnis dioica, madnep, marsh cress, melilot, melilotus, melilotus alba, melilotus officinalis, mentzelia laevicaulis, mentzelia livicaulis, mesembryanthemum, milk thistle, myosotis sylvatica, nebraska fern, oenothera biennis, oenothera fruticosa, onopordon acanthium, onopordum acanthium, our lady's mild thistle, oyster plant, plantago virginica, plumed thistle, plume thistle, poison hemlock, poison parsley, poppy, ranunculus, red bird's eye, red campion, rorippa islandica, salsify, scotch thistle, siberian wall flower, silene dioica, silybum marianum, solanum giganteum, spotted cowbane, spotted hemlock, spotted water hemlock, star-thistle, sundrops, sweet clover, tragopogon porrifolius, vegetable oyster, welted thistle, western wall flower, wheat, white melilot, white sweet clover, wild chervil, wild parsnip, winter fern, woolly thistle, yellow sweet clover, yellow watercress

flora, plant, plant life

biyearly, two-year