An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian; 2nd ed. . channeled leaf-segments, and its apiculate nut. Family 38. CRUCIFERAE B. Juss. Hort. Trian. , rarely somewhat woody, with watery acrid sap, alternate leaves, andracemose or corymbose flowers. Sepals 4, deciduous, or rarely persistent, the2 outer narrow, the inner similar, or concave, or saccate at the base. Petals 4,hypogynous, cruciate, nearl
An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian; 2nd ed. . channeled leaf-segments, and its apiculate nut. Family 38. CRUCIFERAE B. Juss. Hort. Trian. , rarely somewhat woody, with watery acrid sap, alternate leaves, andracemose or corymbose flowers. Sepals 4, deciduous, or rarely persistent, the2 outer narrow, the inner similar, or concave, or saccate at the base. Petals 4,hypogynous, cruciate, nearly equal, generally clawed. Stamens 6, hypogynous,tetradynamous, rarely fewer. Pistil i, compound, consisting of 2 united carpels,the parietal placentae united by a dissepiment; style generally persistent, sometimesnone; stigma discoid or usually more or less 2-lobed. Fruit a silique or silicle,generally 2-celled, rarely i-celled, in a few genera indehiscent or campylotropous, attached to both sides of the septum; endosperm none;cotyledons incumbent, accumbent or conduplicate, or the embryo rarely straight. About 200 genera and 1800 species, of wide geographic distribution. Also known as Bras- Key to Genera. MUSTARD FAMILY. 147 I. Pod continuous, not transversely 2-jointed. A. COTVLEDONS OR INCLMBENT ; PODS DEHISCENT (EXCEPT IN Neslia, Myagriim). a. Pods globose to linear, not greatly elongated nor very broad and flat. ? Pubescence stellate, or of forked stellate, or the hairs 2-lobed. Pods orbicular to linear, more or less flattened parallel to the broad partition (Alysse.\e).Seeds many in each cell of the oval to linear flat pod. i. Draba. Seeds few in each cell of the short pod. Pods little flattened : petals 2-cIeft. 2. Berteroa. Pods much flattened ; petals entire. Flowers white ; pubescence of 2-lobed hairs. 3. Koniga. Flowers yellow ; pubescence stellate. 4. Alyssum. Pods globose or didymous, swollen (Phys.^rieae).
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
