. The Canadian field-naturalist. Natural history; Sciences naturelles. Figure 2. Achillea millefolium photographed in situ on 7 January 2006 at site shown in Figure L Flowering shoot is about 30 cm tall. Brassicaceae Capsella bursa-pastoris (L.) Medik. was among the most common plants flowering in January. It oc- curred at nine sites with one to three plants per site. Flowering individuals were up to 30 cm tall and car- ried a few flowers at the apex of each plant. Leaves were typically green and healthy, although larger plants had generally become decumbent. During the second week, plants wer
. The Canadian field-naturalist. Natural history; Sciences naturelles. Figure 2. Achillea millefolium photographed in situ on 7 January 2006 at site shown in Figure L Flowering shoot is about 30 cm tall. Brassicaceae Capsella bursa-pastoris (L.) Medik. was among the most common plants flowering in January. It oc- curred at nine sites with one to three plants per site. Flowering individuals were up to 30 cm tall and car- ried a few flowers at the apex of each plant. Leaves were typically green and healthy, although larger plants had generally become decumbent. During the second week, plants were mostly very small (5-10 cm high) with only a few florets. On 21 January flowers were found at two sites. Thlaspi arvense L. was among the most robustly flowering species observed. The plants were erect, dark green and with prominent white flowers. T. arvense in flower was as common in January as in any previ- ous collecting period, and flowers were found at one site on 21 January. Raphanus raphanistrum L. occurred at two sites where there were typically many plants. The stems and leaves of these plants were badly wilted and reclin- ing; however a few bright yellow florets and numer- ous clusters of buds remained intact at many apices on many plants. In the second week only a single, badly damaged plant was found at one site. Cardamine pensylvanica Muhl. ex Willd. was the only species clearly protected by the heat shadow of a large building. Dozens of small, prostrate plants each with one to several flowers occurred in a flowerbed along the side of a large brick building. No decline in flowering was noted in the second week and flowers persisted to 21 January. Erysimum cheiranthoides L. was found at two sites and only in the second week. Four large plants were found along a bare concrete foundation for a house. The surrounding lot supported numerous plants of this species but all had gone to seed. A second site had a few small individuals up to 5 cm tall. Both sites were cover
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Keywords: ., bookcentury1900, bookdecade1910, books, booksubjectnaturalhistory
