distichous

(redirected from distichously)
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distichous

[′dis·tə·kəs]
(biology)
Occurring in two vertical rows.
References in periodicals archive ?
The presence of wings is particularly frequent in spikelets with distichously arranged glumes, where the wings are decurrent with the internode of the rachilla, and partially envelope the lower, opposite flower.
or not the flowers; f) rachilla persistent or deciduous at maturity; g) type of rachilla disarticulation at maturity (not disarticulating, disarticulating above the prophyll, disarticulating below the prophyll, shattering with points of abscission at the base of each fruit or not shattering); h) rachilla with wings or wingless, i) wings deciduous or persistent; j) glumes spirally or distichously disposed; and k) glumes persistent or deciduous (completely, incompletely, individually or collectively deciduous).
Agardh) Tseng et Lu to sectional rank and emended their descriptions according to new sets of morphological characters to accommodate species with respectively cylindrical to slightly compressed axes possibly twisted, alternately and spirally arranged, and strongly flattened axes distichously arranged in one plan.
Flowers distichously arranged, 2-4 mm pedicellate, opening during the day; sepals narrowly elliptic, acute, free, 17-19 mm long, carinate, nerved, glabrous, pale green; corolla semi-tubular, spreading at the apex, blue-violet to blue, paler proximally; petals ligulate, acute, 38-42 mm long with a pair of basal appendages; stamens & style exserted.
To my mind, the published form of Dyckia estevesii can be likened to the monstrose crested forms of cactus where the meristem only divides distichously.
In all genera studied (Table 1), the spikelet consists of an indeterminate rachilla, and spirally to distichously arranged glumes, each subtending (or not) a bisexual (or unisexual) flower (Figs.
5 - 2 cm peduncle, erect to spreading, the fertile portion 3-5 cm long distichously 4 to 12-flowered, the rachis broad and excavated, variably pale lepidote.