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Jepson Field Book Transcriptions · Jepson Herbarium
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31_176 Howell Mt. 5 Dec. '15 ---------- - Adenostoma fasciculatum. The old plants offer the most effective resistance to fire. The younger plants, that is those with distinct bulbs (or only one or two bulbs) are almost invariably killed by fire. The history of the root and caudex system I have not completely worked out, but there is this much to be set down. The seedlings send their tap roots down deeply wherever the subsoil conditions permit. Rocky ground may send the taproot laterally. After a certain time, evidently 6 or 8 years, but this |
31_177 Near "Adam & Eve" ---------- point not really determined, a thickening occurs at base of stem a little below but mostly above the surface, which becomes turnip- or bulb-shaped, higher than broad, but sometimes sub-globose. As time goes on extra stems arise from this body, or fire may induce them, and as the stems develop into a heavy bush the bulb-like base disappears (replaced by a heavy crown). The older plants have wholly lateral roots, or a taproot, or a taproot and lateral roots. I do not notice that many old plants are fire-killed, and mostly those having only surface (lateral) roots. The last fire occurred in 1910 or 1911 and was destructive. Regeneration is about 2/3 complete. - Cont p. 178 |
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