Blue Globe Thistle

High above the Indus river valley, the Hemis monastery sits at an altitude of about 3500 meters above mean sea level. Cut off from moist winds both to the north and the south, this is one of the lowest of the high deserts of the world. But at this time, in late summer, verging on autumn, the last of the summer flowers can be seen. My first definite sighting of Blue globe thistles (Echinops cornigerus) came as our car left the highway and worked its way up to the parking lot of the monastery. This is close to the upper end of the range of this plant (although I suspect that ranges are becoming more fluid as the climate becomes more variable), and no other confounding globe thistle grows at this height. It had just rained, perhaps a couple of millimeters, a significant percent of the rain that the plateau gets. This is the season when the Blue globe thistle blooms.

On the verge of autumn, bees were hard at work. The four in the lower photo are definitely carpenter bees of the species Xylocopa pubescens. They have a very interesting social organization, different from honeybee hives, but I’ll leave that story for another day. The single bee in the featured photo is different. I’m afraid I cannot identify it yet, but I wonder whether it is a polyester bee (genus Colletes). Any help in identifying it would be appreciated. For a desert, Ladakh has a surprisingly rich ecology.

Probable, possible

We’d been driving through the desert highway which ran parallel to, and high above, the course of the Indus. The undulating landscape around the highway was carved out of a soft but rocky soil. I found later that the river has been moving soil around the plateau for 10-20 million years, and this aspic made of soil and rock is called the Indus molasse basin. The phrase “lunar landscape” was invented by an unknown hack as an utterly wrong description for this riverine landscape. Millions of tourists now repeat it unthinkingly, because the land does not look green and fertile. But the word for a desert is desert.

Like in any desert there are plants which grow here. There are insect communities which they sustain. There are lizards and spiders which prey on the insects. And there are, very visibly, birds which prey on the predators. During the drive my eye adapted quickly to spotting clumps of grass or plants huddled low to avoid the wind. The altitude means that the air is thin, and the UV levels are high. The resulting glare plays games with your sight, and distinguishing green from the khaki landscape may be hard, unless you have grown up in the hot dusty plains of northern India.

As a result I managed to spot these flowers as we sped by. Nassir Khan, our guide and driver for the day, stepped on the brakes immediately, and I had only a short walk up a slope to where the plant was growing out of a clod of earth. This was a globe thistle for sure. We were at a height of above 3000 m, and considering that we were in Ladakh, this was almost certainly the Himalayan blue globe thistle (Echinops cornigerus). The appearance of the bracts, the flowers, the stems, and the leaves are all consistent with this identification.

But the literature is rife with confusion between E. cornigerus and the snow-white globe thistle (Echinops niveus), perhaps half of it due to amateurs like me. Typically the confusion occurs at lower altitudes, where E. niveus (or even the low-altitude, Indian globe thistle, Echinops echinatus) is mistaken for its high altitude cousin. It is often said that E. niveus is found to a height of 1700 meters in Kashmir, Himachal Pradesh, Uttarakhand and Nepal. But that altitudinal ceiling was only reported in the early 1980s from sites in western Nepal. With warming weathers, and ever increasing traffic, it is not impossible that it has spread its range along this road, the Srinagar-Leh highway. Instead of adding to the confusion, let me keep the issue open until clinching evidence emerges, with the proviso that this is more likely to be Echinops cornigerus.