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<p>1. Arborescent plants (tree ferns)</p>
	<p>2. Petiole base with black</p>
		<p>3. Aphlebias present ......... <italic>Alsophila setosa</italic></p>
		<p>3. Aphlebias absent ......... <italic>Alsophila sternbergii</italic></p>
	<p>2. Petiole base with spines</p>
		<p>4. Petiole scales whitish or bicolor</p>
			<p>5. Petiole base deciduous ......... <italic>Cyathea hirsuta</italic></p>
			<p>5. Petiole base persistent on the stem, scales without setae</p>
				<p>6. Petiole scales concolor (whitish) ......... <italic>Cyathea leucofolis</italic></p>
				<p>6. Petiole scales bicolor (whitish and brown) ......... <italic>Cyathea dichromatolepis</italic></p>
		<p>4. Petiole scales brown</p>
			<p>7. Petiole base deciduous leaving a scar on the stem, indusium globose ......... <italic>Cyathea delgadii</italic></p>
			<p>7. Petiole base persistent on the stem, indusium absent</p>
				<p>8. Secondary veins predominantly forked ......... <italic>Cyathea phalerata</italic></p>
				<p>8. Secondary veins predominantly simple</p>
					<p>9. Petiole with spines at base ......... <italic>Cyathea atrovirens</italic></p>
					<p>9. Petiole without spines ......... <italic>Cyathea glaziovii</italic></p>