Displaying 41 - 69 out of 69 Object(s)
| Term | Definition | |
|---|---|---|
| Hypogeal germination | A type of seed germination in which the cotyledons are retained below the ground. |  |
| Isocotylous | Referring to seedlings in which both cotyledons are similar in shape and size. Compare with anisocotylous. |  |
| Lateral aril | An aril that runs along the side of the seed such as in many, but not all, species of |
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| Macropodial embryo | A solid embryo without differentiated cotyledons; e.g., in Lecythis spp. (Lecythidaceae) and Monstera spp. (Araceae). |  |
| Myrcioid embryo | A type of embryo found in the Myrtaceae in which the cotyledons are normally thin, leafy, and folded, and the narrow, cylindrical hypocotyl is about the same length as the cotyledons and encircling them. Compare with eugenioid embryo and myrtoid embryo. |  |
| Myrtoid embryo | A variable type of embryo found in the Myrtaceae in which the hypocotyl is the same length or much longer than the cotyledons; in genera with hard seed coats, the embryo is C-shaped; in genera with membranous or submembranous seed coats, the hypocotyl often is greatly swollen, and sometimes the whole embryo forms a spiral. Compare with eugenioid embryo and myrcioid embryo. | |
| Pachytesta | A seed coat formed mostly by the extended chalaza and not by the integument(s); note that the integument(s) can be reduced or developed in species with a pachytesta. | |
| Perisperm | Food-storage tissue derived from the nucellus of some flowering plants. | |
| Phanerocotylar cotyledons | A type of seed germination in which the cotyledons emerge from the seed coat. Compare with cryptocotylar. |  |
| Phytomelan | A carbonaceous, opaque material that usually covers the seed coat to give it a black appearance, common in certain monocot families. | |
| Pleurogram | A line or crack, sometimes shaped like a horseshoe, found on the lateral faces of the seed coat of some legumes. | |
| Plumule | The upper portion of the embryo that develops into the primary shoot. | |
| Pseudaril | In Burseraceae, soft aril-like tissue that covers part or all of the pyrene and attracts dispersal agents. |  |
| Radicle | The lower portion of the embryo that develops into the root. Same as hypocotyl. |  |
| Ruminate endosperm | Testa or seed coat folded into the endosperm; e.g., that of many species of Annonaceae, Myristicaceae, and Arecaceae. |  |
| Sarcopachytesta | The fleshy outer layer of a pachytesta. See pachytesta. | |
| Sarcotesta | A layer arising from the integument of a seed. Compare with aril and elaiosome. |  |
| Seed | The mature ovule that contains the embryo within the seed coat. | |
| Seed coat (= testa) | The outer covering of a seed. Same as testa. |  |
| Seedling | Referring to a stage in a plant's development between seed germination and the production of eophylls (= the first true leaves). |  |
| Seminiferous | Bearing seeds. | |
| Shoot apex | That part of the stem of a seedling above the point of attachment of the cotyledons. Same as epicotyl. | |
| Spreading aril | Referring to an aril that spreads around the entire seed and, thus, looks like a sarcrotesta. |  |
| Strophiole | An outgrowth of the seed coat near the hilum. Same as caruncle. | |
| Testa | See seed coat. | |
| Unilaterally winged seed | Referring to a seed wing that arise from one side. |  |
| Utricle | A small, one-seeded, somewhat inflated, usually indehiscent fruit; e.g., in some species of Caryophyllaceae, Lemnaceae, and Plumbaginaceae; the inflated basal chamber formed by the perianth of Aristolochia (Aristolochiaceae); in Cyperaceae, see perigynium. | |
| Vivipary (viviparous) | In plants, germinating while still attached to the parent plant. |  |
| Winged seed | Referring to seeds with a wing-like extensions that surround the seed, are are two sides of the side, or extend from one end of the seed, all of which facilitate wind dispersal. |  |