. Studi sulla vegetazione della Transcaspian lowlands. La botanica. 184 è molto aperto e getta solo una leggera ombra. Le estremità dei rami sono penduli, lungo, sottile, duttile e frusta-simili. Due rami sono mostrati in Fig. 10. Palezkij ha radici misurata a 19 metri di lunghezza. Le foglie sono sparse e pinnate con due lineari lanceolate volantini densamente rivestite con capelli setosi. Il rachide talvolta termina in una esile thorn un centimetro lungo, che spesso persiste fino al prossimo anno. Stipules sono assenti o rappresentato da due piccole spine. La parte distale dell'anno-shoot probabilmente sempre muore

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. Studies on the vegetation of the Transcaspian lowlands. Botany. 184 is very open and casts only a light shade. The ends of the branches are pendulous, long, thin, pliant and whip-like. Two branches are shown in Fig. 10. Palezkij has measured roots 19 metres in length. The leaves are scattered and pinnate with two linear- lanceolate leaflets densely coated with silky hairs. The rachis sometimes ends in a slender thorn one centimetre long, which frequently persists till the next year. Stipules are absent or represented by two small spines. The distal part of the year-shoot probably always dies away before the next vegetative period, also when it is not an inflorescence, which is, however, generally the case (see fig. 10). The succeeding year-shoot arises from the middle part of the first year-shoot. Vigorous year-shoots may be bran- ched, but there is no indication that we have here assimilating branches lasting only one summer. The plant has likewise true leaves. The flowers are purple and are arranged in terminal racemes. Only the lower flowers in a raceme set fruit; these are also the earliest to develope (April); the later flowers are dried up by the heat of summer. The fruit-bearing branches in tig. 10 show the inflorescence bare above the fruits, and it is seen how few fruits there are compared with flowers. The fruit is a yellow, one-seeded, indehiscent, winged "pod" which ripens in May. When ripe it is spirally twisted and this with its lightness enables it to be easily carried off by the wind. The seeds are very hard. According to Palezkij only 2 per ct. of the fresh seeds germinate but they can all be made to do so by cutting the skin. The leaves are isolateral in structure. The epidermis is thick with sunk stomata on both surfaces. Its coating of unilateral hairs is shown in fig. 31. There are about three layers of palisade cells on each side and hardly any spongy mesophyll. The veins have sheaths of hard bast. As to the other Ammodendron specie

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• booksubjectbotany
• bookyear1912