. Selected western flora : Manitoba, Saskatchewan, Alberta . Botany; Botany; Botany. CRUCIFER^ 53. FiQ. 42.— Brassioa nigra. pod constricted between the seeds, and tipped with a flattened, often 1-seeded beak. A troublesome field weed, introduced. 2. B. nigra, (L.) Black Mustard. More slender and not so rough as the preceding; lower leaves with a large terminal lobe; pods short, erect; seeds black. The mustard of commerce, frequently introduced as a weed. 8. ARABIS.' Rock Cress. Pods linear, long and flat, often appressed, seeds in 1 or j-m. 41. _ Srassica 2rows; stigma2-lobed; leaves ,
. Selected western flora : Manitoba, Saskatchewan, Alberta . Botany; Botany; Botany. CRUCIFER^ 53. FiQ. 42.— Brassioa nigra. pod constricted between the seeds, and tipped with a flattened, often 1-seeded beak. A troublesome field weed, introduced. 2. B. nigra, (L.) Black Mustard. More slender and not so rough as the preceding; lower leaves with a large terminal lobe; pods short, erect; seeds black. The mustard of commerce, frequently introduced as a weed. 8. ARABIS.' Rock Cress. Pods linear, long and flat, often appressed, seeds in 1 or j-m. 41. _ Srassica 2rows; stigma2-lobed; leaves , arvensis. pinnatifld if at all divided, the root leaves more or less petiolate, often forming a rosette, the stem leaves sessile, often clasping. Usually annual or biennial herbs, glabrous or nearly so, with white, yellowish, pink, or purple flowers. * Seeds in one now in the cell. t Seeds oblonq or elliptical, small, not winged. 1. A. lyrata, L. Root leaves lyrate-pinnatifid in a rosette; stem leaves spatulate or linear, base tapering; flowers with white petals but yellowish sepals, the petals much longer than the sepals; pods long, flat, usually ascending. Sandy waste places, Alta. 2. A. glabra, (L.) Bernh. Towek Mustard. ' Biennial, tall, 1—3 ft., erect, glaucous above, slightly pubescent below, stem usually simple; root leaves petioled, oblanceolate to oblong, dentate and hairy; stem leaves sessile, lanceolate with sagittate base, glabrous, entire or the lower sparingly dentate; flowers yellowish white, the petals only slightly longer than the calyx; pods linear, erect, and appressed. A. per- foliAta, Lam.) Waste places and fields, tt Seeds okbicular and winged. 3. A. hirsiita, (L.) Scop. Stem erect, usually simple, rough, hairy or nearly glabrous; root leaves obovate or spatulate, dentate, on margined petioles; stem leaves lanceolate, dentate, sessile, clasping the stem at the base; flowers white or greenish white; pods linear, appressed. Rooky or sandy ban
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1915
