Common name: Touch-me-not Balsam
Scientific name: Impatiens noli-tangere 水金鳳、輝菜花
Genus: Impatiens 鳳仙花屬
Family: Balsaminaceae 鳳仙花科, balsam family
Origin: native
Status: very rare
Date: 11th Aug
[145] A large cluster of touch-me-not balsam.
[110_1] An erect, glabrous annual, can reach up to 100 cm.
[101] Individual with flower and young capsule (the linear structure above the yellow flower). Leaves alternate.
[069_1] Leaves 5-12 cm, with 6-15 teeth on each side.
(vs
leaves 5-15 cm, with
more than 20 teeth on each side in
Impatiens parviflora 小花鳳仙花、小花勿碰我, small balsam)
[073_1] Younger leaves.
[073_2] A very young leaf.
[075_1] Underside of the leaf showing the venation.
[074] Stem in zigzag shape. Leaves alternate.
[076] Few-flowered axillary inflorescence.
[076_2] Enlarged photo above showing the leaf base and the teeth.
[142_1] Stem base and a few root could be seen above.
[079_1] There are some swollen structures near the base of the stem. These galls are probably caused by larvae of
Pristerognatha fuligana (a kind of moth belonged to Tortricidae 捲葉蛾科 of Lepidoptera 鱗翅目) . Other botanical sources these swellings are characterisitc for older plants.
[081_cropped] Some red roots? emerged from the gall?
[103] Individual with flower and young capsule (the linear structure above the yellow flower).
[060] Flowers hanging below leaves.
[135] Few-flowered axillary inflorescence.
[114_1] Few-flowered axillary inflorescence. Different stages of flower buds.
[063_1] A bigger flower bud with sepal spur could be seen now.
[054_1] Bract.
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Every flower starts with male stage, followed by female stage. The followings are male stage of flowers:
[103_1] Flowers about 3.5 cm, yellow with brown spots.
[053_3] There are 3 sepals and 5 petals. The above photo showing the Lateral view of the flower with 2 lateral sepals (Lts), 1 lower sepal (Los) with sepal spur (SeS) at its end, 1 dorsal petal or standard petal (Dop), 2 upper petals or basal lobes of lateral petal or wing petal (UpP), 2 lower petals or distal lobes of lateral petal or wing petal (LoP).
[048_3] Front view of the flower showing different parts of it. Keys same as above. It is a flower of male stage. Androecium (An).
[055_3] Upper view of the flower showing different parts of it. Keys same as above. Bract (br).
[120_1] Top view of the flower showing the sepals.

[119_1] Different stages of male stages of the flowers.
[048_1]
[126_1]
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Followings are enlarged photos showing different stages of the androecium:
[119_2] At first, the filaments of stamens completely enclose the green gynoecium in the middle of the flower.
[048_2]
[049_2]
[126_3] This is a later stage of male stage of a flower. There are 5 stamens. Each stamen is composed of 1 filament (Fi) with 2 anthers (An) attached to its end. The white powders near the anthers are the pollens (Po). It could be seen that the filaments (Fi) had moved apart, revealing the green style (St) of the gynoecium. The androecium (filaments and anthers) would dehisce completely afterwards to review the gynoecium and enter the female stage of the flower.
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The followings are female stage of flowers:
[107] After the male part dehisced, the gynoecium (style and stigma) could now be seen. It becomes a flower of female stage now. In this way, it prevents self-pollination by protandry.
[106_1] Enlarged photo above showing the style (Se) and stigma (Sa).
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[066_1] Different stages of capsules.
[112_1] Capsule seems ready to explode to release the seeds..
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[088] Larva of
Deilephila elpenor 紅天蛾, the elephant hawk moth (belonged to
Deilephila 白腰天蛾屬, Sphingidae 天蛾科 of Lepidoptera 鱗翅目) feeding on it.