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SUMMARY:
Route notes describe the march from camp to Lola Pass and a very steep descent, followed by a difficult traverse to a camp on the Chudi Chu with multiple stream crossings. Botanical collections 3634–3643 are listed, including several rhododendrons and primulas with habitat and diagnostic notes.

CONTENT:
20a

Camp to Lola Pass. 2 miles. Continue up R bank for a mile, with a considerable climb over a fir clad ridge, then over boggy open ground. Path then crosses the stream & climbs about 300 ft steeply, gradually easing off & turning more South. The last 300' is fairly steep but the whole route to the Pass is easy.

Descent to camp at m 4. Descent very steep indeed, fairly open for 1/2 mile, then through dense fir & rhodo forest. At m 3 the main stream is crossed to the R bank, & the valley turns South. Follow this down, crossing to L bank at 3 1/2. A poor camp available at m 4.

3634. R. exasperatum. A fine Barbatum Ser. Rhod. Common among R. Thomsonii & Abies. Beautiful rich crimson corolla.

3635. Rhod. lopangense Thomsonii Series. Very common. Seems to have more indumentum on under leaf than R. Thomsonii.

3636. Primula aff. atrodentata. (P. crispa?) This does not appear to be P. atrodentata. It is smaller, a smaller less pronounced eye, colour rather different. Only seen in one place.

3637. Primula vernicosa. Only differs in habitat. First time seen in dense jungle. Smaller flower than usual.

3638. Diapensia yellow. The first time we have seen this yellow one. Common.

3639. Asteropyrum peltatum. Ranunculus sp.

3640. Primula geraldinae sp. nov. Common where found. The mark of this is the farinaceous eye. Only growing on quite inaccessible cliff faces in wet moss. A pretty primula & new to us.

3641. Rhod. sulphureum sp. (small yellow shrub). Fairly common, on cliff faces.

3642. Rhod. forrestii var repens sp. aff repens. Does not appear to be repens, or even serpens. Found to the left (North) of Primula geraldinae 3640.

3643. Rhod. hodgsonii grande.

Camp to Camp on Chudi Chu. 6m. Keep down the L bank through dense rhodo & fir forest. Path very bad indeed, along logs & up & down notched logs, for 2 miles to bridge (1 plank) over main stream to R. bank. Thence path very bad still through dense forest, very steep in places to a very small clearing - room for three tents to camp, where there is a bridge to the L bank again. Path very difficult the whole way. Rough bearing of march 340° M.

SUMMARY:
Route described from the right bank past Dotrang to Natrampa, with notes on dense, Bhutan-like jungle and a good camp site. At Natrampa they halt and collect several notable plants, including rhododendrons, a yellow primula, Paraquilegia, and Diapensia, and later find unusual rhododendrons near a cascade along the Lung road.

CONTENT:
The road keeps pretty high over the Right bank, up and down, till about mile 3, when it is 800 ft or so above the valley bed. Here a ridge is crossed, where the path used to go down a ladder. Two miles further on a fair sized village is passed, called Dotrang. The path keeps below this, crosses a small side stream, and leads on more or less level for a while, then down hill to Natrampa. A good Camping Ground just beyond. The jungle gradually becomes thicker and more wet zone-like, till here it is just like Bhutan, on the North face, but dry, except for small watercourses, mostly high falls, where vegetation is dense. On Left bank at a waterfall I saw rhododendron 1346 and a yellow sikkimensis primula 1348, while looking for these found a Paraquilegia 1350 in flower. Lumsden found one or two rhododendrons, and Pinko and Tsongpen came in with a lovely mass of rhododendrons and a Diapensia, from the North face cliff. There is any amount of stuff here, so we stop a day.

27th April. Halt at Natrampa. A really good day. We went out along the Lung road to the first cascade, about a mile downstream. There we found a most unusual red rhododendron 1352, a beautiful mauve one 1354, and an unusual yellow one.

SUMMARY:
From Ganju Tang, the writer records a long march over the Rudo La from 5:00 am to 2:00 pm, with rain and mist on the east side and dry conditions on the west. They note more rhododendrons on the east and report collecting about 21 alpine flowers, including several Primula species and Diapensia.

CONTENT:
18th Rhod. list. sp. 18887.
glaucophyllum 18887
pendulum 18888
cinnabarinum 18889

circumstances.

18th May Ganju Tang. A long march over the Rudo La taking from 5:00 am till 2:00 pm. I was lucky I had a mule which nobly carried me to the top of the pass with hardly a bit left out. We took from 5:00 till 10:00 to reach the pass, and it was through rain and mist all the way. Curiously, the mist disappeared on the west side. There had been no rain this side all day. It is obviously a much drier side, as the flora showed that. The East side is the one for Rhododendrons without a doubt. There are many more on that side. Primula elongata (18897) was not seen on the East. Primula hookeri not on the west. Altogether we got 21 flowers today, all nice. How pleasant to see alpines again after all the low muck I've seen for 2 weeks or more. Primula calderana (18890), elongata (18895), hookeri (18896) and smithiana (18900) were taken. Primula sikkimensis only in bud. We also got Diapensia (18891), but saw no Bry