Impatiens hongkongensis

Genus Impatiens L. (Balsaminaceae)
The largest genus in Balsaminaceae which produces spectacular flowers. It comprises of over 900 species all over the world and ranges from India to South-east Asia. 240 has been found in China where most of them are distributed in the south-western part of China.

Impatiens hongkongensis is mostly found in wet places by streams and in ravines. It produces pale yellow flowers which may attract people to collect them from the wild for ornamental uses. It is thus protected under Forestry Regulations and listed in Rare and Precious Plants of Hong Kong.

Flowers of I. hongkongensis are probably protandrous (Presentation of pollens come befores stigma becoming active) to prevent self-pollination. Bombus species (Bumble-bees) and hawk moths are most likely to be the pollinators. However, detailed pollination ecology of the plant has not been studied. Too little is known so far for this narrowly distributed species.

Vespa discolor

Genus Vespa, also known as hornets, contains 22 species all over the world and eight (V. mandarinia is newly discovered) can be found in Hong Kong so far. They will construct their own colony comprises of a queen, males and workers. The nesting sites vary from one species to another and also intraspecifically.

Vespa discolor is one of the most common hornets in Hong Kong. This species is un-aggresive and will not attempt to attack deliberately unless too much disturbance is caused to their nests. It is a generalist hunter and scavenger which prey on any kind of insects which they are able to kill (A wandering glider Pantala flavescens is killed in the picture). The nesting period of V. discolor is quite long which reaches 9 months from colony initiation to disintegration.

Eria sinica

Genus Eria Lindl. (Orchidaceae)
About 370 described species under the genus and they are mainly distributed in tropical Asia and Australia. 43 species are in China including 6 in Hong Kong.

Eria sinica is one of the smallest orchids found in Hong Kong while the whole individual shown in the picture is just about 1 cm height. It is apparently very similar to another native orchid Eria pusilla. These two species were mixed up before due to their great similarity in Hong Kong. They are sometimes found to grow together on steep sides of boulders together with mosses. It's very difficult to spot them even when they are flowering.

Eria sinica has a narrow distribution where it is only found in or near Hong Kong and Hainan province. The type specimen is also collected from Hong Kong. Eria sinica and all other wild orchids are protected under Forestry regulations in Hong Kong. I do think that everyone should not harvest and take the wild orchids. Everyone should has the rights to appreciate the orchids and other rare plants in the wild. Orchids blooming in the wild are always the most spectacular BUT not at the garden!

Creobroter gemmata

It is recently reported that a mantid (identified as Creobroter gemmata) was seen jumping into a stream and a horsehair worm emerged through its anus in Hong Kong. Mantids are the common hosts of horsehair worm (Nematomorpha) in tropical and subtropical regions worldwide.

The horsehair worms copulate in its free-living stage and produce aquatic larvae. They are then actively ingested by other insects with aquatic larvae such as mosquitoe. They serve as vectors between the aquatic and terrestrial environment. The horsehair larvae continue their development if the insects are captured and eaten by mantids which are the final hosts of the worms. The worms then grow inside the mantids' abdomen and get maturity. They will then influence the hosts to approach water and emerge from the hosts. The factor influencing the hosts are still not understood.

Crested Mynah (Acridotheres cristatellus)

Crested Mynah is distributed through central and southern China and it is a common resident occurring throughout Hong Kong. It mainly inhabits agricultural areas, around fish ponds, villages and urban areas.

Local birdwatchers have seen that Crested Mynah attempted to kleptoparasitise Chinese Pond Heron deliberately. (This is a common breeding habit of cuckoos)

It is very social which are typically seen in flocks. The highest count of the aggregation recorded in Hong Kong was 600 at Chek Lap Kok on 7th Oct 07 according to "The Avifauna of Hong Kong".

Sonerila cantonensis

Genus Sonerila Roxb. (Melastomataceae)
Contains about 170 species distributed in tropical Asia. 12 are in the mainland where only one species are found in Hong Kong.

Though this species is described to be found in montane forest according to Flora of China, it is found at about 250 m a.s.l. in Hong Kong.

Commelina communis

Genus Commelina Linn. (Commelinaceae)
About 100 species distributed all over the world where the majority is found in tropical and subtropical region. 7 species are distributed in China while 5 are in Hong Kong.

Commelina communis is the most widespread species in China within the genus.