dryopteris2 的最愛
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什麼
蔥草屬 (屬 Xyris)觀察者
arenicola描述
comparison between Xyris iridifolia (left) and Xyris difformis (right).
first photos show the difference between the shape of the spikes, and the broad flattened scape of iridifolia versus the narrowly winged scape of difformis, highlighted by the sunlight in pic 2.
3rd photo compares habit — iridifolia taller, with longer and much broader leaves; difformis shorter, with narrower leaves.
4th pic shows seed difference — elongate and dark grey in iridifolia, rounded and pale yellow in difformis.
both found together in bottomland forest, as typical; creek in background
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觀察者
gracemccartha描述
heads congested at tips of lateral branches, inflorescences not densely leafy; involucres 4-5 mm high; leaves oblanceolate to elliptic, margins entire or inconspicuously toothed; rays white and drying lavender and >20, stems mostly glabrous, rhizomatous perennial, phyllaries not subulate tipped, disc flowers 4-6 mm long
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觀察者
janetwright描述
Drainage ditch in pine forest.
Branch leaf 2.5 x 1.3mm, stem leaf 1.8 x 0.7mm.
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觀察者
janetwright描述
Gravel parking lot at golf course. Culm 15cm. Fibrous roots, annual. All leaves are cauline, 25mm x 2mm. Ligule ciliate. Inflorescnce a panicle 5cm x 3cm. Spikelets 7mm x 1.5mm, 12-15 florets. 1st glume 1mm, keeled. 2nd glume 1.5mm. Lemmas 2.5mm, strong green lateral vein. Pedicels all shorter than spikelet. Caryopsis 0.6mm x 0.3mm, no groove. 2 stamens I think.
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什麼
莎草屬 (屬 Cyperus)觀察者
arenicola描述
comparison pic of Cyperus metzii (left), C. hortensis (center), and C. sesquiflorus (right); pic 2 shows spikelets from each plant, arranged in the same order
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什麼
單花莎草 (Cyperus retroflexus)觀察者
dylanpderouen描述
Open, sandy loam ridge with patches of reforested, early and late-successional areas throughout.
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什麼
潭莎草 (Cyperus ochraceus)觀察者
kathymcaleese描述
Key breaks(Illust. Fl. or E. TX):
Achene trigonous/styles 3-branched
Spikelets in each group arising from the same point
Leaves well developed
Scales of spikelets with tips not reflexed
Scales > 1mm long
Plants large perennials
Scales 2 keeled at base
Leaf blades, bracts, etc not nodulose
Culms smooth to the touch
Inflorescence bracts all horizontal to ascending, none like a continuation of the culm
Spikelets 10mm long, (2mm wide) achenes broadly ellipsoid,(with acuminate beak, narrow stipelike base, honeycomb surface), approx. 1.3mm long.
(lower florets maturing, shedding scales + achenes as upper ones develop)
