. Agricultural botany, theoretical and practical. Botany, Economic; Botany. CHAPTER XXXVII. CULTIVATED BARLEYS (Genus Hordeuin). I. Characters of the Genus.—The inflorescences or ' ears' are spike-like and consist of many groups of three single-flowered spikelets (Fig. 159) arranged from top to bottom of an elongated rachis. Each spikelet appears practically sessile on the rachis; but a triplet of single-flowered spikelets really represents a primary branch with two opposite lateral branches each bearing one flower. The rachilla on which the spikelet grows laterally is prolonged and appears as
. Agricultural botany, theoretical and practical. Botany, Economic; Botany. CHAPTER XXXVII. CULTIVATED BARLEYS (Genus Hordeuin). I. Characters of the Genus.—The inflorescences or ' ears' are spike-like and consist of many groups of three single-flowered spikelets (Fig. 159) arranged from top to bottom of an elongated rachis. Each spikelet appears practically sessile on the rachis; but a triplet of single-flowered spikelets really represents a primary branch with two opposite lateral branches each bearing one flower. The rachilla on which the spikelet grows laterally is prolonged and appears as a small bristle - like structure, readily seen with a lens, lying within the ' furrow' of a barley grain as in Fig. 163. The groups of spikelets are arranged alternately at notches on opposite sides of the rachis,. Fig. isg.—A^ Piece of rachis of six-rowed barley showing a triplet of single-flowered pikelets, r Rachis of the ear ;tf empty glume; so that the whole ear appears to 7floweri'nggi'_ have six longitudinal rows of .hfwin'gTtri^^o/Llle^rw^red^i'eS flnu/prt: ^'^ central flowtr fertile, the two lateral liuwci s. flowers (a) imperfect, r Rachis of the car ; e The empty glumes («, Fig. ?J^P(J;^,'")'^° i,^''™'""^ ^'"""^''" ™''"" 159) are very narrow and stand side by side in front of the flowering glume. The latter is broad and possesses a long awn which acts as a transpiring organ. The longest awns are usually attached to the largest. 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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