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from article Mustard
Black mustard (Brassica nigra). (Photo courtesy of Jennifer Anderson, USDA–NRCS PLANTS Database)
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from article Forensic botany
Surface of a green bean pod, showing its spines using (a) light microscope (courtesy of David O. Norris) and (b) scanning electron microscope (courtesy of Meredith Lane).
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from article Asian vegetables
A head of Chinese cabbage. (Credit: Jiang Hongyan/Shutterstock)
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from article Asian vegetables
Bok choy, also known as pak choy or Chinese mustard. (Credit: Agricultural Research Service, U.S. Department of Agriculture)
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from article Asian vegetables
Daikon (oriental winter radish) is a notable vegetable in Japan. (Credit: Franco Folini)
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from article Asian vegetables
Mung bean sprouts.
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from article Asian vegetables
Chinese okra. The length of the fruit can reach 30–38 cm (12–15 in.). (Credit: Forest and Kim Starr)
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from article Lichens
The ascolichen Teloschistes chrysophthalmus. (Credit: Jason Hollinger)
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from article Lichens
Cuplike lichens of the genus Cladonia. (Credit: Jacinta Lluch Valero)
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from article Ebony
Persimmon (Diospyros virginiana). (Photograph by Dot Paul, National Resources Conservation Service, USDA)
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from article Tangerine
Tangerine fruits (Citrus reticulata). (Photo by Forest and Kim Starr)
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from article Forage crops
Bahia grass (Paspalum notatum), a popular warm-season grass used as a forage crop. (Photo by James H. Miller and Ted Bodner, Southern Weed Society)
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from article Forage crops
Alfalfa (Medicago sativa), the most important legume forage crop, cut and drying prior to its final harvest. (Photo by Howard F. Schwartz, Colorado State University)
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from article Nitrogen-fixing trees
Nitrogen-fixing Rhizobium bacteria form nodules on the roots of various legume trees. (Copyright © McGraw Hill)
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from article Nitrogen-fixing trees
A perennial nodule, several years old, formed on the roots of common or black alder (Alnus glutinosa) by symbiosis with Frankia (a nitrogen-fixing bacterium). (Copyright © McGraw Hill)
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from article Wheat
A sheaf of wheat (Triticum) surrounded by some small piles of seed (grain). (Credit: Scott Bauer/Agricultural Research Service, U.S. Department of Agriculture)
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from article Wheat
A combined harvester-thresher is used to harvest wheat. (Credit: Scott Bauer/Agricultural Research Service, U.S. Department of Agriculture)
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from article Wheat
Adaptation regions for wheat in the United States. (Credit: U.S. Department of Agriculture)
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from article Wheat
Wheat (Triticum) growing in a field. The wheat inflorescence is a spike bearing sessile spikelets arranged alternately on a zigzag rachis (main axis). (Credit: Tim McCabe/Natural Resources Conservation Service, U.S. Department of Agriculture)
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from article Wheat
Black stem rust of wheat, which produces urediniospores in reddish-brown pustules. The fungus Puccinia graminis f. sp. tritici is responsible for this plant disease. The inset shows a close-up view of an infected stem. (Credit: Agricultural Research…
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from article Wheat
Loose smut of wheat, caused by Ustilago tritici. (Credit: Erik Stromberg/Virginia Polytechnic Institute and State University)
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from article Apical dominance
Model of strigolactone production. Auxin promotes genes (listed below the arrow) required for strigolactone biosynthesis. This can occur in roots and shoots. Strigolactones move into the bud region and are perceived by the F-box response protein,…
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from article Apical dominance
Simplified view of the interaction of three branching hormones. Auxin promotes production of strigolactones (SL), whereas limiting that of cytokinins (CK) at bud nodes. This blocks bud outgrowth in intact plants (left). After decapitation, supply of…
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from article Conic section
Four conic sections. (a) Circle. (b) Ellipse. (c) Parabola. (d) Hyperbola.
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from article Ginger
Ginger (Zingiber officinale). (USDA)
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from article Reforestation
Forests and people in the world.
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from article Reforestation
Relative amounts of land needed to produce 1000 ft3 of wood per year. (1) Mature, upland, natural hardwood stand. (2) Pine plantation owned by a farmer and managed with minimum inputs. (3) Pine plantation managed by a forest company and managed with…
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from article Plant phylogeny
A phylogeny of the major groups of plants, showing the history of diversification from a common ancestor (left). The origin of plants in an endosymbiotic event is not depicted, nor are later secondary endosymbiotic events. Major groups are enclosed…
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from article Plant phylogeny
Primary and secondary endosymbiotic events in the history of plants. Plants originated in a primary endosymbiotic event, when a prokaryotic photosynthetic cyanobacterial cell was engulfed by a eukaryotic cell and maintained as a plastid. This line…
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from article Plant phylogeny
The life cycle of a fern, involving the alternation of sporophyte and gametophyte generations. Reproduction by sporophytes yields gametophytes, and reproduction by gametophytes yields sporophytes. A complete life cycle begins with either a…
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from article Guava
Fruit and leaves of the guava (Psidium guajava). (Photo courtesy of Forest and Kim Starr)
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from article Tupelo
Leaves of black tupelo (Nyssa sylvatica). (Photograph courtesy of Larry Allain, USGS National Wetlands Research Center)
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from article Kentucky coffee tree
Seeds of the Kentucky coffee tree (Gymnocladus dioica). (Photo courtesy of Steve Hurst, ARS Systematic Botany and Mycology Laboratory, USDA–NRCS PLANTS Database)
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from article Kentucky coffee tree
Kentucky coffee tree (Gymnocladus dioica). (a) Parts of branch showing leaf scars and winter buds. (b) Branch.
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from article Pistachio
Pistachios (Pistacia vera) from California. (Photo by Scott Bauer, Agricultural Research Service, U.S. Department of Agriculture)
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from article Catenary
Catenary and force triangle which keeps a portion of the string in equilibrium.
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from article Catenary
Relation of catenary to the tractrix which is its involute.
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from article Legendre functions
Legendre polynomials Pn(x), n = 2, 3, 4, 5.
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from article Legendre functions
Legendre functions of the second kind, Qn(x). (After E. Jahnke and F. Emde, Tables of Functions with Formulae and Curves, 4th ed., Dover Publications, 1945)
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from article Lepidodendrales
Reconstructions of tree-sized Carboniferous rhizomorphic tree-lycopsids, illustrating architectural variation. (After R. M. Bateman et al., Experimental cladistic analysis of anatomically preserved arborescent lycopsids from the Carboniferous of…
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from article Lepidodendrales
Primitive bisexual cone of the Flemingites type, borne by Paralycopodites, with apically concentrated microsporangia and basally concentrated megasporangia containing several megaspores. (After C. A. Arnold, An Introduction to Paleobotany,…
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from article Circle
A circle, with radius, diameter, and circumference indicated. (Credit: McGraw-Hill Education)
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from article Circle
Nine-point circle and Euler line PMH.
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from article Goat production
Domesticated goats (Capra hircus) raised for meat goat production. (Photo by Susan Boyer, Agricultural Research Service, U.S. Department of Agriculture)
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from article Goat production
Close-up view of a Saanen goat. (Photo by Milan Kořínek)
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from article Goat production
Mechanical (automatic) milking of a purebred Nigerian Dwarf dairy goat on an elevated stand. (Photo courtesy of Lesa Wilke, Bramblestone Farm, Ohio; www.bramblestonefarm.com)
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from article Trihedron
Trihedron and trihedral angles.
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from article Trihedron
Spherical triangle ABC formed by intersection of sphere with a trihedron. The center of the sphere is at the vertex of the trihedron.
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from article Fungi
Porcini mushrooms (Boletus edulis) are members of the Basidiomycota division of Fungi. (Credit: Digoarpi/Shutterstock)
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from article Fungi
Spore types (upper illustrations) and structures of parent mycelia (lower illustrations) in fungi.
