. Agricultural botany, theoretical and practical. Botany, Economic; Botany. go THE INFLORESCENCE the apex and the oldest nearest the base of the rachis. If the flowers are sessile, or borne immediately on pedicels, that is, on lateral branches of the first order, the inflorescence is described as simple (Fig. 39); when the main axis branches more than once before bearing the flowers the inflorescence is compound (Fig. 41). A. Simple Racemose Inflorescences.—In these the main axis bears either sessile flowers or flowers with pedicels, (i) With elongated axis and sessile floivers. The spike {A,
. Agricultural botany, theoretical and practical. Botany, Economic; Botany. go THE INFLORESCENCE the apex and the oldest nearest the base of the rachis. If the flowers are sessile, or borne immediately on pedicels, that is, on lateral branches of the first order, the inflorescence is described as simple (Fig. 39); when the main axis branches more than once before bearing the flowers the inflorescence is compound (Fig. 41). A. Simple Racemose Inflorescences.—In these the main axis bears either sessile flowers or flowers with pedicels, (i) With elongated axis and sessile floivers. The spike {A, Fig. 39). Examples are seen in Greater Plantain {Planiago major L.) and Verbena. Parts of the in- florescences of most grasses are small spikes or spikelets (see p. 476). The spadix is a form of spike with a thick, fleshy axis. Sometimes a large bract, termed a spathe, encloses this form of inflorescence, as in Lords-and-Ladies {Arum maculaiu7n L.), white ' Trumpet-Lily ' (Richardia), and many palms. The catkin is a spike-like inflorescence, which bears only unisexual flowers. Examples of catkins of staminate flowers are seen in the hazel and willow; catkins of carpellary flowers are found on the willow. In some plants the catkins are compound inflorescences. (ii) With elongated axis and stalked flowers— The raceme {B, Fig. 39). In this form of inflorescence the flower-stalks or pedicels are of nearly equal ;Examples. Fig. 39.—Racemose, or indefinite inflorescences, with elongated axis. A a spike ; B a raceme ; C a corymb ; d bract; r rachis ; p Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Percival, John, 1863-1949. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
