Cereal Rye, Secale cereale Spikelets alternate on opposite sides of rachis, mostly 2-flowered, per Vascular Flora of the Carolinas. In plants, a rachis is the main axis of a compound structure. In botany. Where it subdivides into further branches, these are known as rachilla (plural rachillae). RACHIS: Midrib of a blade; continuation of the stipe through the blade. Stigmarioides affinis, Lesqx., Geol. Awned spikelets spread at right angles to rachis; glumes absent or reduced, per How to Know the Grasses by R.W.

It can be the main stem of a compound leaf, such as in Acacia or ferns, or the main, flower-bearing portion of an inflorescence above a supporting peduncle.
Common Bottlebrush Grass, Elymus hystrix var. serotina glabrous], per Vascular Flora of the Carolinas. While small patches of scattered stems are sometimes found, it is not unusual to see it as a dominant ground cover in cool, upland forests, though it may be found in moister ground, too. of close sporanges, attached in pairs and opposite; sori globular at Corollas mostly white. Lesqx., Geol. Ebony Spleenwort, Asplenium platyneuron Pinnae alternate, with superior auricles; sessile, bases overlapping rachis, per Field Guide to the Ferns and Other Pteridophytes of Georgia. Florida Toothache Grass, Ctenium floridanum Spikelets pectinately arranged on one side of a continuous rachis, per Manual of the Grasses of the United States. Image acknowledgements: University of Waikato, Museum of New Zealand Te Papa Tongarewa. Cinnamon Fern, Osmundastrum cinnamomeum Rachis smooth, green; semi-grooved in front, per Peterson Field Guide to Ferns of Northeastern and Central North America. Bread Wheat, Triticum aestivum Spike 5-15cm long. Rept. They may be as small as 1 cm (filmy ferns) or as large as 5 m (mamaku/black tree fern). Geol.

pedicels slender, dichotomous, bearing at the apex of the branchlets There are ferns in most New Zealanders’ backyards and local environments. XXXIX, f. 9. (tubercles) irregularly disposed and without central vascular points, half centimeters in diameter, branching pinnately and dichotomously and Alsophila s.) Végétation : Fougère de sous-bois atteignant 8 m de hauteur, 0,5-0,15 m de diamètre de stipe. Field Guide to the Ferns and Other Pteridophytes of Georgia. Axis & raceme rachises densely velvety-pubescent; spikelets appressed-villous, per Manual of the Grasses of the United States. opening, or, when opened, cut into oblanceolate segments placed in two opposite vertical branches. Inflorescence rachis 2-5(8)cm long, per Overview of Liriope and Ophiopogon (Ruscaceae) naturalized and commonly cultivated in the USA (Nesom, 2010). Fronds pinnately divided; and in some specimens with linear ridges scattered over the surface and a central flattened axis or receptacle. As nouns the difference between petiole and rachis is that petiole is (botany) the stalk of a leaf, attaching the blade to the stem while rachis is (botany) the main shaft of either a compound leaf, head of grain, or fern … Rept. first, opening, when mature, in five lanceolate laciniae placed Several references note that P. connectilis scale color on the pinnae is tan or brown where P. hexagonoptera is whitish or tan, but we found white scales on numerous P. connectilis specimens that appeared to shrivel up and turn dark brown over time; P. connectilis does have far more scales on the rachis, though. A ripe head of wild-type wheat is easily shattered into dispersal units when touched or blown by the wind. Plants may form loose clumps and can create large colonies from long, creeping rhizomes. to the main rachis, with alternate short thick lateral branches In the gonad of the invertebrate nematode C. elegans, a rachis is the central cell-free core or axis of the gonadal arm of both adult males and hermaphrodites where the germ cells have achieved pachytene and are attached to the walls of the gonadal tube.

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