. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. rizema), orcompound, palmately, or pinnately compound. The palmately com-pound leaf may be trifoliate of three leaflets, or as in lupine, there may beas many as seven to eleven leaflets. The pinnately compound leavesmay be trifoliate with the middle leaflet provided with a longer petiolulethan the other two, or it may have more than three leaflets, up to many,with a terminal leaflet (odd, or imparipinnate), or with a pair of terminalleaflets (paripinnate), or ending in a simple
. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. rizema), orcompound, palmately, or pinnately compound. The palmately com-pound leaf may be trifoliate of three leaflets, or as in lupine, there may beas many as seven to eleven leaflets. The pinnately compound leavesmay be trifoliate with the middle leaflet provided with a longer petiolulethan the other two, or it may have more than three leaflets, up to many,with a terminal leaflet (odd, or imparipinnate), or with a pair of terminalleaflets (paripinnate), or ending in a simple, or a branched, tendril(tendriliform, or cirrhiferous). The bases of the leaflets and the base ofthe common petiole have swellings known as pulvini. The presence ofthese pulvini enables the leaflets to assume nyctitropic and hot-sun posi- See Chapter 16. 181 l82 PASTORAL AND AGRICULTURAL BOTANY tions, and in the sensitive plants, represented by Mimosa pudica, a stimu-lation of a terminal leaflet, for example, causes the movement of all ofthe leaflets of the compound leaf, if the stimuli are sufficiently Pig. 73.—Details of Pea (Pisum sativum). A, Flower; B, Longitudinal section offlower showing ovary, diadelphous stamens, etc.; C, diadelphous stamens and stylewith stigma; D, pistil of pea flower; E, seed deprived of its coats; F, floral diagram;5 = sepals; p = petals; st = stamens; c = carpel. The movement in the sensitive plants of this family is due to the movementof water from the lower to the upper side of the pulvinus, so that the whole
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