Nuttallanthus D.A. Sutton, gen. nov. A Linaria Miller corolla labio abaxiali labium adaxialem valde superanti, palato vix evoluto, orem tubi vix obstructo, calcari perangusto aut absenti, seminibus prismaticis, cristis 4-7 longitudinalibus praeditis differt. Herbae annuae ve1 biennes, caulibus heteromorphis, ramis haud volubilibus; caules fertiles erecti; caules steriles prostrati ve1 decumbentes. Folia plus minusve homomorpha, simplicia, integra, sessilia, pinnatinervia; folia caulium fertilium plerumque alterna; folia caulium sterilium verticillata. Flores zygomorphi pedicellati, in racemis bracteatis dispositi. Bracteae foliis plerumque parviores, haud ramulo volubili subtendentes. Pedicellus haud volubilis. Calyx profunde divisus; lobi aequales integri imbricati ve1 valvati, tubum corollae breviores. Corolla tubo angusto, plus minusve cylindrico, basi peranguste calcarato ve1 inconspicue gibboso, limbo valde inaequaliter bilabiato, labio adaxiali angusto, saepe brevissimo, erecto ve1 reflexo, labio abaxiali limbum adaxialem valde superanti, palato vix evoluto, ostium tubi vix obstructo; lobi integri ve1 emarginati. Stamina fertila 4, didynama inclusa, antherarum paribus ad margines cohaerentibus, connectivo supra antheram haud dilatato; staminodium minutum, antheram rudimentalem haud ferens. Stigma capitatum integrum, inter paria staminum fertilium positum. Capsula subglobosa ve1 oblongo-ovoidea, parietibus tenuibus sed firmis, septo erecto recto, loculis aequalibus multiseminalibus uterque valvis 4-5, ab apice 0.25-0.5 longitudinis basin versus dehiscentibus. Semina plus minusve radialiter symmetrica, prismatica, angulis 4-7 praedita, cristis discretis vix evolutis ve1 tenuibus, margine integris ve1 dentatis, superficiebus laevibus ve1 tuberculatis, cellulis interstitiorum saepe papillatis; hilum angustum basale. Annual or biennial herbs; stems heteromorphic, the branches not twining; fertile stems erect; sterile stems prostrate or decumbent. Leaves more or less homomorphic, simple, entire, sessile, pinnately-veined; leaves of fertile stems mostly alternate; leaves of sterile stem verticillate. Flowers zygomorphic, pedicellate, in terminal bracteate racemes. Bracts usually smaller than foliage leaves, not subtending additional branches. Pedicels not cirrhous. Calyx deeply divided; lobes equal, entire, imbricate or valvate, shorter than corolla-tube. Corolla with tube narrow, more or less cylindric, very narrowly calcarate or inconspicuously gibbous at base; limb very unequally 2-lipped, the adaxial lip narrow, often very short, erect or reflexed, the abaxial lip greatly exceeding adaxial, with palate scarcely developed, scarcely occluding mouth of tube; lobes entire or emarginate. Fertile stamens 4, didynamous, included, the adjacent pairs of anthers marginally coherent, the connective not dilated above anther; staminode minute, without rudimentary anther, sometimes absent. Stigma capitate, entire, between pairs of fertile stamens. Capsule subglobose to oblong-ovoid, the walls thin but firm, septum erect, straight; loculi equal, many-seeded, each loculus dehiscing by 4-5 valves, 0.25-0.5 length from apex to base. Seeds more or less radially symmetrical, prismatic with 4-7 angles; ridges discrete, scarcely developed or thin, entire or dentate; faces smooth or tuberculate, the cells of the interstices often papillate; epicuticular waxes absent; hilum narrow, basal. By Sutton (1988)