acaulis stemless acicularis needle-like acuminatus long-pointed, tapering aestivalis summer affinis related to agrostoides similar to agrostis airoides sky-blue alatus winged alba white albidus, albus white alopecuroides foxtail alternifolius alternate-leaved altissimus very tall amabilis lovely amplexicaulis clasping the stem anceps two-headed or edged angustifolius narrow-leaved apiculatus tipped with a point annua yearly arachnifera spiderwebby arborescens tree-like arenarius of sandy places arenicola sand inhabitant argenteus silvery argillaceus of clay or clay-colored argutus sharp-toothed arida dry aridus arid aristatus bearded arundinacea reed-bearing arundinaceous reed-like arvensis of cultivated fields asper rough asperifolia rough leaves atropurpureus dark-purple atrovirens dark-green aureus golden australis southern azureus sky-blue baccatus berried barbatus barbed, bearded barbinodis barbed at nodes barbulatum bearded basirmea branches low; toward bottom bicolor two-colored bidentata two-toothed bifidum two-forked bifidus twice-cut biflorus two-flowered borealis northern brachystachy short-spiked bulbifera bulb-bearing caeruleus sky-blue, dark-blue campanularia bell-flowered campestris of the fields or plains candidus white, shining canescens gray-hairy capillaris hair-like capitatus headed carinatus keeled catharticus cathartic caudatus tailed cernuus drooping chloranthus green-flowered ciliatifolium hairy leaves cilianensis hairy ciliaris, ciliatus fringed cinereus ash-colored circulare round clandestinus concealed coccineus scarled colonum cultivated comatus with hair communis gregarious commutatus changing comosus long-haired compressa compressed compressus compressed confertus crowded confusus confused, uncertain contortus contorted contracta narrowed cordatus heart-shaped corniculatus horned crassifolius thick-leaved cristatus crested crus-galli cockspur cryptandrus hidden stamens