A Laboratory Guide for General Botany
A Laboratory Guide for General Botany
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Calamophyta. Class II. Equisetineae. Order. Equisetales. Family. Equisetaceae. Genus. Equisetum. Species, (e. G. ) arvense.
B. Habitat: i. The field horsetail (E. Arvense), is common along railway embankments, roadsides and fields. It apparently prefers north-facing slopes, and has a great tendency to become weedy.
C. Naked-eye Characters: i. The Stem.
(a) Using herbarium specimens or alcoholic material, if fresh material is not available, observe the underground stem (rhizome), and the upright... aerial branches.
(b) Of the latter, observe two kinds; (i) non-green, unbranched, bearing only scale leaves, and terminating in a prominent strobilus or cone; (2) green and branched, bearing leaves, but no cone.
(c) Which kind of aerial branch appears first above ground in the spring ? What advantage may this possess for the species?
(d) Explain the physiological significance of the green color of the non-reproductive branches.
140 EQUISETUM 141 Of what significance, in this connection, is their profuse branching?
What to read after A Laboratory Guide for General Botany?
You can find similar books in the "Read Also" column, or choose other free books by Gager, C. Stuart (Charles Stuart), 1872-1943 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Calamophyta. Class II. Equisetineae. Order. Equisetales. Family. Equisetaceae. Genus. Equisetum. Species, (e. G. ) arvense.
B. Habitat: i. The field horsetail (E. Arvense), is common along railway embankments, roadsides and fields. It apparently prefers north-facing slopes, and has a great tendency to become weedy.
C. Naked-eye Characters: i. The Stem.
(a) Using herbarium specimens or alcoholic material, if fresh material is not available, observe the underground stem (rhizome), and the upright... aerial branches.
(b) Of the latter, observe two kinds; (i) non-green, unbranched, bearing only scale leaves, and terminating in a prominent strobilus or cone; (2) green and branched, bearing leaves, but no cone.
(c) Which kind of aerial branch appears first above ground in the spring ? What advantage may this possess for the species?
(d) Explain the physiological significance of the green color of the non-reproductive branches.
140 EQUISETUM 141 Of what significance, in this connection, is their profuse branching?
What to read after A Laboratory Guide for General Botany?
You can find similar books in the "Read Also" column, or choose other free books by Gager, C. Stuart (Charles Stuart), 1872-1943 to read onlineMoreLess
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