Native plants associated with the area are the shrubs: Haleakala sandalwood, mamane, pukiawe, aalii, mountain pilo, ohelo, silver geranium, kupaoa; two or three ferns; two sedges; and three native grasses.
Two thirds of the distance to the grove, the crater trail from the inn starts up the mountain to the left. This is a connecting link, 1¾ miles long, to the Halemauu Trail which it joins a half mile below its start on the highway. _See Numbered Points of Interest, No. 9._
The Sliding Sands Trail, the popular route into the crater, starts from the parking area at the Observatory. It is constructed along the south side of the crater to Kapalaoa Cabin six miles away. Connecting trails go to Paliku Cabin, four miles farther. The Halemauu Trail has two upper ends, at the 8,000-foot elevation on the highway and on the Hosmer Grove Campground Spur near Silversword Inn. Halemauu Trail goes down Leleiwi Pali, the west wall, to Holua Cabin, four miles from the road or six miles from the lodge. The trail continues easterly from Holua for six miles along the north side of the crater floor to Paliku. Branch trails are built to points of interest. The Kaupo Trail through Kaupo Gap leaves Paliku Cabin and the crater to make a rapid descent of the southern, sun-drenched slope.
Each of the three visitor cabins within the crater, Kapalaoa, Paliku, and Holua, is equipped with running water, a wood-burning cookstove, firewood, kerosene lamps, cooking and eating utensils, twelve bunks, mattresses, and blankets. Use of these cabins by hikers on a priority reservation basis is granted free of charge by the Park. In consideration for their use _cabins should be left clean and in order_ by each party. The following arrangements are necessary: write the Park, giving an outline of your proposed trip, number in the party, exact calendar dates, and names of specific cabins which you wish to use each night. The address is: “Hawaii National Park, Haleakala Section, P. O. Box 456, Kahului, Maui, Hawaii.” Cabin reservations can also be made by telephoning the Park. When you arrive in the Park, stop at the Administration Building for your permit, cabin key, and orientation.
_For safety reasons, all visitors are required to obtain permits from the rangers for all trips into the crater, other than those with Silversword Inn guides._