diff --git a/dvc/commands/experiments/ls.py b/dvc/commands/experiments/ls.py
index 69beca90e..2e50b091c 100644
--- a/dvc/commands/experiments/ls.py
+++ b/dvc/commands/experiments/ls.py
@@ -3,6 +3,7 @@ import logging
 
 from dvc.cli.command import CmdBase
 from dvc.cli.utils import append_doc_link
+from dvc.ui import ui
 
 logger = logging.getLogger(__name__)
 
@@ -16,20 +17,13 @@ class CmdExperimentsList(CmdBase):
             num=self.args.num,
             git_remote=self.args.git_remote,
         )
-        tags = self.repo.scm.describe(exps)
-        remained = {baseline for baseline, tag in tags.items() if tag is None}
-        base = "refs/heads"
-        ref_heads = self.repo.scm.describe(remained, base=base)
 
         for baseline in exps:
-            name = baseline[:7]
-            if tags[baseline] or ref_heads[baseline]:
-                name = tags[baseline] or ref_heads[baseline][len(base) + 1 :]
             if not name_only:
-                print(f"{name}:")
+                ui.write(f"{baseline}:")
             for exp_name in exps[baseline]:
                 indent = "" if name_only else "\t"
-                print(f"{indent}{exp_name}")
+                ui.write(f"{indent}{exp_name}")
 
         return 0
 
diff --git a/dvc/repo/experiments/ls.py b/dvc/repo/experiments/ls.py
index 62d751117..e209f49d9 100644
--- a/dvc/repo/experiments/ls.py
+++ b/dvc/repo/experiments/ls.py
@@ -6,7 +6,7 @@ from dvc.repo.scm_context import scm_context
 from dvc.scm import iter_revs
 from dvc.types import Optional
 
-from .utils import exp_refs, exp_refs_by_baseline
+from .utils import exp_refs_by_baseline
 
 logger = logging.getLogger(__name__)
 
@@ -20,19 +20,22 @@ def ls(
     num: int = 1,
     git_remote: Optional[str] = None,
 ):
-    results = defaultdict(list)
-    if all_commits:
-        gen = exp_refs(repo.scm, git_remote)
-        for info in gen:
-            results[info.baseline_sha].append(info.name)
-        return results
-
-    rev = rev or "HEAD"
-
-    revs = iter_revs(repo.scm, [rev], num)
-    rev_set = set(revs.keys())
+    rev_set = None
+    if not all_commits:
+        revs = iter_revs(repo.scm, [rev or "HEAD"], num)
+        rev_set = set(revs.keys())
     ref_info_dict = exp_refs_by_baseline(repo.scm, rev_set, git_remote)
-    for rev, ref_info_list in ref_info_dict.items():
-        results[rev] = [ref_info.name for ref_info in ref_info_list]
+
+    tags = repo.scm.describe(ref_info_dict.keys())
+    remained = {baseline for baseline, tag in tags.items() if tag is None}
+    base = "refs/heads"
+    ref_heads = repo.scm.describe(remained, base=base)
+
+    results = defaultdict(list)
+    for baseline in ref_info_dict:
+        name = baseline[:7]
+        if tags[baseline] or ref_heads[baseline]:
+            name = tags[baseline] or ref_heads[baseline][len(base) + 1 :]
+        results[name] = [info.name for info in ref_info_dict[baseline]]
 
     return results
diff --git a/dvc/repo/experiments/refs.py b/dvc/repo/experiments/refs.py
index f563732bc..d5e594e98 100644
--- a/dvc/repo/experiments/refs.py
+++ b/dvc/repo/experiments/refs.py
@@ -23,9 +23,7 @@ class ExpRefInfo:
 
     namespace = EXPS_NAMESPACE
 
-    def __init__(
-        self, baseline_sha: Optional[str] = None, name: Optional[str] = None
-    ):
+    def __init__(self, baseline_sha: str, name: Optional[str] = None):
         self.baseline_sha = baseline_sha
         self.name: str = name if name else ""
 
@@ -33,7 +31,7 @@ class ExpRefInfo:
         return "/".join(self.parts)
 
     def __repr__(self):
-        baseline = f"'{self.baseline_sha}'" if self.baseline_sha else "None"
+        baseline = f"'{self.baseline_sha}'"
         name = f"'{self.name}'" if self.name else "None"
         return f"ExpRefInfo(baseline_sha={baseline}, name={name})"
 
@@ -41,11 +39,7 @@ class ExpRefInfo:
     def parts(self):
         return (
             (self.namespace,)
-            + (
-                (self.baseline_sha[:2], self.baseline_sha[2:])
-                if self.baseline_sha
-                else ()
-            )
+            + ((self.baseline_sha[:2], self.baseline_sha[2:]))
             + ((self.name,) if self.name else ())
         )
 
@@ -54,14 +48,13 @@ class ExpRefInfo:
         try:
             parts = ref.split("/")
             if (
-                len(parts) < 2
-                or len(parts) == 3
+                len(parts) < 4
                 or len(parts) > 5
                 or "/".join(parts[:2]) != EXPS_NAMESPACE
             ):
                 raise InvalidExpRefError(ref)
         except ValueError:
             raise InvalidExpRefError(ref)
-        baseline_sha = parts[2] + parts[3] if len(parts) >= 4 else None
+        baseline_sha = parts[2] + parts[3]
         name = parts[4] if len(parts) == 5 else None
         return cls(baseline_sha, name)
diff --git a/dvc/repo/experiments/utils.py b/dvc/repo/experiments/utils.py
index 06e15b0e5..b2422d4b0 100644
--- a/dvc/repo/experiments/utils.py
+++ b/dvc/repo/experiments/utils.py
@@ -79,13 +79,13 @@ def exp_refs_by_rev(scm: "Git", rev: str) -> Generator[ExpRefInfo, None, None]:
 
 
 def exp_refs_by_baseline(
-    scm: "Git", revs: Set[str], url: Optional[str] = None
+    scm: "Git", revs: Optional[Set[str]] = None, url: Optional[str] = None
 ) -> Mapping[str, List[ExpRefInfo]]:
     """Iterate over all experiment refs with the specified baseline."""
     all_exp_refs = exp_refs(scm, url)
     result = defaultdict(list)
     for ref in all_exp_refs:
-        if ref.baseline_sha in revs:
+        if revs is None or ref.baseline_sha in revs:
             result[ref.baseline_sha].append(ref)
     return result
 
diff --git a/tests/func/experiments/test_experiments.py b/tests/func/experiments/test_experiments.py
index 1d4329b8c..12d41aac0 100644
--- a/tests/func/experiments/test_experiments.py
+++ b/tests/func/experiments/test_experiments.py
@@ -417,7 +417,7 @@ def test_packed_args_exists(tmp_dir, scm, dvc, exp_stage, caplog):
         assert "Temporary DVC file" in caplog.text
 
 
-def _prepare_experiments(tmp_dir, scm, dvc, exp_stage):
+def test_list(tmp_dir, scm, dvc, exp_stage):
     baseline_a = scm.get_rev()
     results = dvc.experiments.run(exp_stage.addressing, params=["foo=2"])
     exp_a = first(results)
@@ -428,54 +428,29 @@ def _prepare_experiments(tmp_dir, scm, dvc, exp_stage):
     ref_info_b = first(exp_refs_by_rev(scm, exp_b))
 
     tmp_dir.scm_gen("new", "new", commit="new")
-    baseline_c = scm.get_rev()
     results = dvc.experiments.run(exp_stage.addressing, params=["foo=4"])
     exp_c = first(results)
     ref_info_c = first(exp_refs_by_rev(scm, exp_c))
 
-    return baseline_a, baseline_c, ref_info_a, ref_info_b, ref_info_c
-
-
-def test_list(tmp_dir, scm, dvc, exp_stage):
-    (
-        baseline_a,
-        baseline_c,
-        ref_info_a,
-        ref_info_b,
-        ref_info_c,
-    ) = _prepare_experiments(tmp_dir, scm, dvc, exp_stage)
-
-    assert dvc.experiments.ls() == {baseline_c: [ref_info_c.name]}
+    assert dvc.experiments.ls() == {"master": [ref_info_c.name]}
 
     exp_list = dvc.experiments.ls(rev=ref_info_a.baseline_sha)
     assert {key: set(val) for key, val in exp_list.items()} == {
-        baseline_a: {ref_info_a.name, ref_info_b.name}
+        baseline_a[:7]: {ref_info_a.name, ref_info_b.name}
     }
 
     exp_list = dvc.experiments.ls(all_commits=True)
     assert {key: set(val) for key, val in exp_list.items()} == {
-        baseline_a: {ref_info_a.name, ref_info_b.name},
-        baseline_c: {ref_info_c.name},
+        baseline_a[:7]: {ref_info_a.name, ref_info_b.name},
+        "master": {ref_info_c.name},
     }
 
-
-def test_list_cli(tmp_dir, scm, dvc, capsys, exp_stage):
-    from dvc.cli import main
-
-    baseline_a, _, ref_info_a, ref_info_b, ref_info_c = _prepare_experiments(
-        tmp_dir, scm, dvc, exp_stage
-    )
-
-    # Make sure that we prioritize the current branch name
     scm.checkout("branch", True)
-
-    capsys.readouterr()
-    assert main(["exp", "list", "-A"]) == 0
-    cap = capsys.readouterr()
-    assert set(cap.out.split()) == set(
-        ["branch:", baseline_a[:7] + ":"]
-        + [ref_info_a.name, ref_info_b.name, ref_info_c.name]
-    )
+    exp_list = dvc.experiments.ls(all_commits=True)
+    assert {key: set(val) for key, val in exp_list.items()} == {
+        baseline_a[:7]: {ref_info_a.name, ref_info_b.name},
+        "branch": {ref_info_c.name},
+    }
 
 
 def test_subdir(tmp_dir, scm, dvc, workspace):
diff --git a/tests/func/experiments/test_remote.py b/tests/func/experiments/test_remote.py
index aa67d8237..93b82a14f 100644
--- a/tests/func/experiments/test_remote.py
+++ b/tests/func/experiments/test_remote.py
@@ -151,7 +151,6 @@ def test_list_remote(tmp_dir, scm, dvc, git_downstream, exp_stage, use_url):
     ref_info_b = first(exp_refs_by_rev(scm, exp_b))
 
     tmp_dir.scm_gen("new", "new", commit="new")
-    baseline_c = scm.get_rev()
     results = dvc.experiments.run(exp_stage.addressing, params=["foo=4"])
     exp_c = first(results)
     ref_info_c = first(exp_refs_by_rev(scm, exp_c))
@@ -165,13 +164,13 @@ def test_list_remote(tmp_dir, scm, dvc, git_downstream, exp_stage, use_url):
     git_downstream.tmp_dir.scm.fetch_refspecs(remote, ["master:master"])
     exp_list = downstream_exp.ls(rev=baseline_a, git_remote=remote)
     assert {key: set(val) for key, val in exp_list.items()} == {
-        baseline_a: {ref_info_a.name, ref_info_b.name}
+        baseline_a[:7]: {ref_info_a.name, ref_info_b.name}
     }
 
     exp_list = downstream_exp.ls(all_commits=True, git_remote=remote)
     assert {key: set(val) for key, val in exp_list.items()} == {
-        baseline_a: {ref_info_a.name, ref_info_b.name},
-        baseline_c: {ref_info_c.name},
+        baseline_a[:7]: {ref_info_a.name, ref_info_b.name},
+        "master": {ref_info_c.name},
     }